CN114735754A - Barium ferrite and preparation method thereof - Google Patents
Barium ferrite and preparation method thereof Download PDFInfo
- Publication number
- CN114735754A CN114735754A CN202210569026.2A CN202210569026A CN114735754A CN 114735754 A CN114735754 A CN 114735754A CN 202210569026 A CN202210569026 A CN 202210569026A CN 114735754 A CN114735754 A CN 114735754A
- Authority
- CN
- China
- Prior art keywords
- barium ferrite
- barium
- preparation
- eutectic solvent
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/42—Magnetic properties
Abstract
The invention relates to the technical field of magnetic materials and wave-absorbing materials, in particular to barium ferrite and a preparation method thereof. The preparation method of the barium ferrite comprises the following steps: adding the precipitant solution into a mixed solution of a barium source, an iron source and a eutectic solvent, carrying out coprecipitation reaction, carrying out solid-liquid separation after the reaction is finished to obtain a precursor, and calcining the precursor to obtain the barium ferrite; the eutectic solvent comprises a mixture of choline chloride and ethylene glycol. According to the invention, the eutectic solvent is used as the solvent of the reaction system, so that precipitates can be uniformly dispersed in the coprecipitation reaction process, and the static magnetic property and stability of the barium ferrite are improved.
Description
Technical Field
The invention relates to the technical field of magnetic materials and wave-absorbing materials, in particular to barium ferrite and a preparation method thereof.
Background
Barium ferrite (BaFe)12O19) Has higher Curie temperature, better saturation magnetization, single-axis anisotropy, coercive force and magnetic conductivity, better corrosion resistance, oxidation resistance and wear resistance, is a ferrite material with better performance, lower cost and suitability for industrial production, and is widely appliedThe method is applied to the fields of electronics, computers, communication, traffic, aerospace and the like.
In recent years, with the rapid development of science and technology, various advanced precision instruments and devices are gradually developed in the directions of miniaturization, intellectualization, high integration, high storage density and ultrahigh-speed transmission, which puts higher requirements on core materials for manufacturing various devices, so that high-performance barium ferrite is one of important research points.
The performance of barium ferrite is closely related to the synthesis method and the synthesis process thereof. The barium ferrite is synthesized by a plurality of methods, and the common methods mainly comprise a sol/gel-self-propagating method and a chemical coprecipitation method. Wherein, the sol/gel-self-propagating method is to form sol by complexing carboxyl in citric acid and metal cations in solution, obtain gel by evaporating water, and prepare BaFe by spontaneous combustion and roasting of the gel12O19. Although the method has the advantages of simple process and uniform product particle distribution, CO which does not meet the requirement of green chemistry can be generated in the preparation process2CO and NH3And the like, and the production cost is high, and the industrialization is difficult to realize particularly due to the limitation of a synthesis process.
The chemical coprecipitation method is to use Fe3+、Ba2+Coprecipitation reaction is carried out on the precursor and a precipitator in aqueous solution to prepare a precursor, and BaFe is obtained after the precursor is roasted12O19. The method has low environmental pollution in the preparation process, and is suitable for industrial production.
However, in the prior art, in the process of coprecipitation reaction, agglomeration phenomenon is easy to occur, which can cause the dispersion degree of iron salt and barium salt in the precipitate to be reduced, thereby leading to the prolongation of the roasting reaction time of the precursor, the rise of the roasting temperature, or the reduction of the forward proceeding degree of the reaction, and also reducing the adjustable range of the performance of the barium ferrite.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The first purpose of the invention is to provide a preparation method of barium ferrite, which can ensure that precipitates are uniformly dispersed in a coprecipitation reaction process by adopting a eutectic solvent with a specific composition as a solvent of a reaction system, thereby improving the static magnetic property and the stability of the barium ferrite.
The second object of the present invention is to provide a barium ferrite having low preparation cost, excellent static magnetic properties, and good stability.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the invention provides a preparation method of barium ferrite, which comprises the following steps:
adding the precipitant solution into a mixed solution of a barium source, an iron source and a eutectic solvent, carrying out coprecipitation reaction, carrying out solid-liquid separation after the reaction is finished to obtain a precursor, and calcining the precursor to obtain the barium ferrite;
wherein the eutectic solvent comprises a mixture of choline chloride and ethylene glycol.
According to the invention, the eutectic solvent with a specific composition (namely the mixture of choline chloride and ethylene glycol) is used as the solvent of the reaction system, so that precipitates can be uniformly dispersed in the coprecipitation reaction process of the chemical coprecipitation method, and the performances of the barium ferrite, including the static magnetic performance and the stability of the barium ferrite, are improved.
Particularly, the magnetostatic performance of the barium ferrite prepared by the invention is superior to that of the barium ferrite prepared by the conventional chemical coprecipitation method of a conventional aqueous solution system, the sol/gel-self-propagating method and other traditional methods, and is also superior to that of the barium ferrite prepared by the secondary chemical coprecipitation method.
Specifically, the mixed solution of choline chloride and ethylene glycol is used as a eutectic solvent, the eutectic solvent is formed by mixing quaternary ammonium salt and a hydrogen bond donor compound, and the eutectic solvent is applied as a synthetic solvent of barium ferrite and has the following main advantages: low cost, stability in air and water; contains large and asymmetric ions, and has low lattice energy and low surface tension, so the melting point is low; compared with the traditional aqueous solution, the capacity of dissolving metal oxide is improved by 5-22000 ten thousand times, the metal salt can be uniformly dispersed in a liquid environment through the electrostatic action of anions and cations, in the traditional aqueous solution system, the metal salt and the precipitating agent are quickly nucleated and aggregated, in a eutectic solvent system, because a certain viscosity exists, the slow reaction between the metal salt and the precipitating agent has enough time to find a low-energy configuration interface, when the precipitating agent is added, the precipitating agent can be uniformly dispersed in the liquid environment due to the good liquid environment provided by the precipitating agent, so that on one hand, the precipitation reaction is more sufficient, namely, the uniform dispersion of raw materials in the reaction system is beneficial to the nucleation process of products, and on the other hand, the formed nuclei are more uniformly dispersed in the solution and the phenomenon of aggregation and growth of precipitates is easily avoided; because the precipitate particles in the precursor are fine and uniform, a metastable state structure is generated, and according to the Ostwald rule, in the calcination process of the precursor, along with the rise of the calcination temperature or the extension of the reaction time, the precursor gradually changes to a stable crystal form, and in the process, larger crystal grains can grow by consuming other small crystal grains.
In addition, the preparation method of the barium ferrite provided by the invention has the advantages of simple operation, easily controlled reaction process, suitability for mass production, low cost, stable process, easy repetition and the like.
In addition, the preparation method of the barium ferrite provided by the invention can realize the adjustment of the magnetic property of the barium ferrite by changing the reaction conditions, wherein the reaction conditions comprise: the dosage and the proportion of each component, the pH value of the mixed material, the calcination temperature and the calcination time of the precursor and the like.
The eutectic solvent with a specific composition (namely, the mixture comprising choline chloride and glycol) provided by the invention can improve the saturation magnetization and coercive force of the prepared barium ferrite.
Here, saturation magnetization (Ms) refers to the maximum magnetization that can be achieved when a magnetic material is magnetized in an external magnetic field, and is called saturation magnetization. Saturation magnetization is a characteristic of ferromagnetic substances and is an extremely important magnetic parameter of permanent magnetic materials.
The coercive force (denoted by Hc) means that the magnetic induction B of a magnetic material does not return to zero when an external magnetic field returns to zero after saturation magnetization, and the magnetic induction B can return to zero only by adding a magnetic field with a certain magnitude in the opposite direction of the original magnetic field, which is called coercive field and is also called coercive force.
Preferably, in the mixture of the choline chloride and the ethylene glycol, the molar ratio of the choline chloride to the ethylene glycol is 0.2-1.2 (0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 or 1.1) to 1. The magnetic properties (including saturation magnetization and coercive force) of the barium ferrite can be adjusted by changing the molar ratio of choline chloride and ethylene glycol. The molar ratio in the above range is favorable for improving the magnetic property of barium ferrite.
Preferably, the mixed liquid of the barium source, the iron source and the eutectic solvent further comprises water.
Preferably, the volume ratio of the water to the eutectic solvent is 0.01-10 (0.1, 1, 2, 3, 4, 5, 6, 7, 8 or 9 can be selected as well) to 1.
The magnetic performance (including saturation magnetization and coercive force) of the barium ferrite can be adjusted by changing the volume ratio of water to the eutectic solvent, namely changing the dosage ratio of the water to the eutectic solvent.
The volume ratio in the range is favorable for further improving the magnetic property of the barium ferrite.
Preferably, in the mixed liquid of the barium source, the iron source and the eutectic solvent, the molar ratio of the iron source to the barium source is 9-12.5 (10, 11 or 12 can be selected) to 1.
The molar ratio of the barium source to the iron source is also important, the magnetic property of the barium ferrite can be changed, and the barium source and the iron source in the molar ratio range can be adopted in the application, so that the property of the barium ferrite can be further improved.
In some embodiments of the invention, the iron source comprises Fe3+With OH in the precipitant solution-In a molar ratio of 1: 3; ba of the barium source2+With CO in the precipitant solution3 2-In a molar ratio of 1: 2.
preferably, the precipitating agent comprises a mixture of sodium carbonate and sodium hydroxide.
Preferably, the precipitant is selected from a mixture of sodium carbonate and sodium hydroxide, and the molar ratio of the sodium carbonate to the sodium hydroxide is 3-7 (4, 5 or 6 can also be selected) to 1;
preferably, the precipitant solution is CO3 2-The molar concentration of (b) is 0.001-0.03 mol/L, including but not limited to any one of 0.005mol/L, 0.01mol/L, 0.015mol/L, 0.02mol/L, 0.025mol/L or a range between any two.
The kind, amount and concentration of the precipitant will have a certain influence on the magnetic performance of the prepared barium ferrite. The adoption of the precipitator of the specific kind, the molar ratio and the molar concentration is beneficial to improving the saturation magnetization and the coercive force of the prepared barium ferrite.
Preferably, in the process of carrying out the coprecipitation reaction, the pH of the mixed material is controlled to be 7-12, including but not limited to the value of any one of 8, 9, 10 and 11 or the value in the range between any two of the values.
In the process of carrying out coprecipitation reaction, the pH value of the mixed material has great influence on the magnetic property of the prepared barium ferrite, and the pH value in the range is favorable for improving the static magnetic property and the stability of the barium ferrite.
Preferably, the calcining temperature is 800-1200 ℃; including but not limited to, the values of any one of 830 ℃, 850 ℃, 880 ℃, 900 ℃, 920 ℃, 950 ℃, 970 ℃, 1000 ℃, 1050 ℃, 1100 ℃, 1150 ℃ or ranges between any two.
Preferably, the calcination time is 0.5 to 4 hours, including but not limited to any of 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours, 3.5 hours, or a range between any two.
In some specific embodiments of the present invention, the reaction time of the coprecipitation reaction is 1 to 3 hours.
Because the eutectic solvent-choline chloride and ethylene glycol are used as the solvents of the reaction system, the precipitate can be uniformly dispersed in the coprecipitation reaction process, so the reaction condition of the barium ferrite prepared by the method is easier to realize, for example, the time for coprecipitation reaction is obviously shortened, the roasting temperature is lower, the roasting time is shorter, and the dropping process of adding the precipitant solution does not need to be strictly controlled.
The invention also provides the barium ferrite which is prepared by the preparation method of the barium ferrite.
The barium ferrite prepared by the invention has excellent magnetic performance, good stability and low preparation cost.
In some embodiments of the present invention, after the solid-liquid separation, the method further comprises the steps of washing with water and drying.
Preferably, the water is washed until the water washing liquid is neutral.
In some particular embodiments of the invention, the barium source comprises a soluble barium salt;
preferably, the soluble barium salt comprises barium chloride and/or barium nitrate.
In some specific embodiments of the invention, the iron source comprises a soluble ferric salt;
preferably, the soluble ferric salt comprises at least one of ferric sulfate, ferric chloride, and ferric nitrate.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the preparation method of the barium ferrite, the eutectic solvent with a specific composition is used as the solvent of the reaction system, so that precipitates can be uniformly dispersed in the coprecipitation reaction process, and the static magnetic property and the stability of the barium ferrite are obviously improved.
(2) The preparation method of the barium ferrite provided by the invention can realize the adjustment of the magnetic property of the barium ferrite by changing the reaction conditions, such as the types and the use amounts of all components, the pH value of the mixed material, the calcination temperature and the calcination time of the precursor and the like.
(3) The preparation method of the barium ferrite provided by the invention has the advantages that the reaction conditions are easier to realize, and the method specifically comprises the following steps: the reaction time of the coprecipitation reaction is obviously shortened, the calcination temperature of the precursor is low, the calcination time is short, and the dripping process of adding the precipitant solution does not need to be strictly controlled.
(4) The preparation method of the barium ferrite provided by the invention also has the advantages of low preparation cost, simple operation, easily controlled reaction process, stable and easily repeated process, suitability for mass production and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is an XRD pattern of barium ferrite provided in example 1 of the present invention;
FIG. 2 is an XRD pattern of barium ferrite provided in example 2 of the present invention;
FIG. 3 is a VSM of barium ferrite provided in example 1 of the present invention;
FIG. 4 is a VSM of barium ferrite provided in example 2 of the present invention;
FIG. 5 is a VSM of barium ferrite provided in example 3 of the present invention;
FIG. 6 is a VSM of barium ferrite provided in example 4 of the present invention;
FIG. 7 is a VSM of barium ferrite provided in embodiment 5 of the present invention;
FIG. 8 is a VSM of barium ferrite provided in embodiment 6 of the present invention;
FIG. 9 is a VSM diagram of barium ferrite provided in comparative example 1 of the present invention;
FIG. 10 is a VSM graph of barium ferrite provided in comparative example 2 of the present invention;
FIG. 11 is a VSM of barium ferrite provided by comparative example 3 of the present invention;
FIG. 12 is a VSM graph of barium ferrite provided in comparative example 4 of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are conventional products which are not indicated by manufacturers and are commercially available.
Example 1
The preparation method of the barium ferrite provided by the embodiment comprises the following steps of:
(1) uniformly mixing 0.1mol of choline chloride and 0.25mol of ethylene glycol to obtain a eutectic solvent (namely the molar ratio of the choline chloride to the ethylene glycol is 0.4: 1); then 0.0124mol Fe (NO)3)3·9H2O and 0.0013mol Ba (NO)3)2·2H2Dissolving O (namely the molar ratio of the iron source to the barium source is about 9.5) in 200mL of the eutectic solvent to obtain a mixed solution;
(2) dissolving sodium carbonate and sodium hydroxide in a molar ratio of 6:1 in distilled water to obtain CO3 2-A precipitant solution with a concentration of 0.015 mol/L;
(3) adding the precipitant solution obtained in the step (2) into the mixed solution obtained in the step (2) to perform coprecipitation reaction, continuously stirring in the reaction process, and controlling the pH of the mixed material to be 11; filtering after the reaction is finished, washing the precipitate obtained by filtering until the filtrate is neutral, and drying to obtain a precursor;
(4) and (4) calcining the precursor obtained in the step (3) at 1000 ℃ for 2h to obtain the barium ferrite.
Example 2
The barium ferrite provided in this example is prepared in substantially the same manner as in example 1, except that Ba (NO) is added in step (1)3)2·2H2The amount of O was replaced with 0.00118mol, i.e. the molar ratio of iron source to barium source was about 10.5: 1.
Example 3
The barium ferrite provided in this example was prepared in substantially the same manner as in example 2, except that in step (1), Fe (NO) was added3)3·9H2O and Ba (NO)3)2·2H2And water is added at the same time of O, and the volume of the added water is 10 times of that of the eutectic solvent.
Example 4
The barium ferrite provided in this example is prepared by the same method as that of example 2, except that in step (1), the amount of ethylene glycol is replaced by 0.083mol (0.1 mol, but the amount of choline chloride is not changed), that is, the molar ratio of choline chloride to ethylene glycol is 1.2: 1.
Example 5
The barium ferrite provided in this example was prepared in substantially the same manner as in example 2, except that in step (3), the pH of the mixed material was controlled to 9.
Example 6
The barium ferrite provided in this example was prepared in substantially the same manner as in example 2, except that the calcination time was replaced with 1h in step (4).
Comparative example 1
The preparation method of the barium ferrite provided by the comparative example is basically the same as that of the example 1, except that the step (1) is different, and the step (1) in the comparative example is as follows: 0.0124mol Fe (NO)3)3·9H2O and 0.0013mol Ba (NO)3)2·2H2O (i.e., the molar ratio of the iron source to the barium source is about 9.5) was dissolved in 200mL of deionized water to obtain a mixed solution.
Comparative example 2
The preparation method of the barium ferrite provided by the comparative example is basically the same as that of the example 2, except that the step (1) is different, and the step (1) in the comparative example is as follows: 0.0124mol Fe (NO)3)3·9H2O and 0.00118molBa (NO)3)2·2H2O (i.e., the molar ratio of the iron source to the barium source is about 10.5:1) was dissolved in 200mL of deionized water to obtain a mixed solution.
Comparative example 3
The barium ferrite provided in this comparative example was prepared in substantially the same manner as in example 2 except that 0.25mol of ethylene glycol was replaced with 0.25mol of urea in step (1) (i.e., the eutectic solvent was a mixture of choline chloride and urea).
Comparative example 4
The barium ferrite provided in this comparative example was prepared in substantially the same manner as in example 2, except that, in step (1), the amount of ethylene glycol was replaced with 0.05mol (but the amount of choline chloride was not changed, and was still 0.1mol), that is, the molar ratio of choline chloride to ethylene glycol was 2: 1.
examples of the experiments
The barium ferrites obtained in example 1 and example 2 were subjected to XRD detection, and the results are shown in fig. 1 and fig. 2, respectively.
As can be seen from FIG. 1, the main component of the product obtained in example 1 was BaFe12O19With only very small amounts of BaO impurities present.
As can be seen from FIG. 2, the product obtained in example 2 was BaFe12O19Wherein no impurities are found, i.e. the product BaFe12O19Is a pure phase.
The barium ferrite prepared in each example and each comparative example was tested for saturation magnetization and coercive force, and the test results are shown in table 1 below.
The method for testing the saturation magnetization and the coercive force comprises the following steps: a Vibrating Sample Magnetometer (VSM); the test instrument is as follows: 7404 from LakeShore corporation, usa.
Specifically, fig. 3 is a VSM diagram of barium ferrite provided in embodiment 1 of the present invention; FIG. 4 is a VSM of barium ferrite provided in example 2 of the present invention; FIG. 5 is a VSM of barium ferrite provided in embodiment 3 of the present invention; FIG. 6 is a VSM of barium ferrite provided in embodiment 4 of the present invention; FIG. 7 is a VSM of barium ferrite provided in embodiment 5 of the present invention; FIG. 8 is a VSM of barium ferrite provided in embodiment 6 of the present invention; FIG. 9 is a VSM diagram of barium ferrite provided in comparative example 1 of the present invention; FIG. 10 is a VSM plot of barium ferrite provided by comparative example 2 of the present invention; FIG. 11 is a VSM graph of barium ferrite provided in comparative example 3 of the present invention; FIG. 12 is a VSM of barium ferrite provided by comparative example 4 of the present invention.
TABLE 1 test results of saturation magnetization and coercive force of each group of barium ferrites
As can be seen from table 1, it can be seen from comparative example 1 and comparative example 1, example 2 and comparative example 2 that the addition of the eutectic solvent can improve the magnetostatic properties of the product.
It can be seen from comparison of example 2 and example 3 that barium ferrite having high magnetostatic properties can be prepared by changing the volume ratio of the eutectic solvent to water.
By comparing the example 2 with the example 4, the ratio of choline chloride and glycol is changed, and the static magnetic property of the product can be regulated and controlled.
As can be seen by comparing example 2, example 5 and example 6, the static magnetic properties of barium ferrite can be controlled by changing the pH value and the calcination time.
It can be seen by comparing example 2 with comparative example 3 that the magnetostatic properties of barium ferrites prepared using other kinds of eutectic solvents are not as good as those of barium ferrites prepared using a mixture of choline chloride and ethylene glycol as a eutectic solvent.
It can be seen by comparing example 2 with comparative example 4 that the molar ratio of choline chloride and ethylene glycol is important, and the barium ferrite obtained has better magnetostatic properties when the molar ratio provided by the present invention is used.
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the above embodiments are merely illustrative of the technical solution of the present invention and are not restrictive; those of ordinary skill in the art will understand that: modifications may be made to the above-described embodiments, or equivalents may be substituted for some or all of the features thereof without departing from the spirit and scope of the present invention; the modifications or the substitutions do not cause the essence of the corresponding technical solutions to depart from the scope of the technical solutions of the embodiments of the present invention; it is therefore intended to cover in the appended claims all such alternatives and modifications that are within the scope of the invention.
Claims (10)
1. The preparation method of the barium ferrite is characterized by comprising the following steps of:
adding the precipitant solution into a mixed solution of a barium source, an iron source and a eutectic solvent, carrying out coprecipitation reaction, carrying out solid-liquid separation after the reaction is finished to obtain a precursor, and calcining the precursor to obtain the barium ferrite;
wherein the eutectic solvent comprises a mixture of choline chloride and ethylene glycol.
2. The method according to claim 1, wherein the molar ratio of the choline chloride to the ethylene glycol is 0.2-1.2: 1.
3. The method according to claim 1, wherein the mixed solution of the barium source, the iron source and the eutectic solvent further comprises water.
4. The preparation method according to claim 3, wherein the volume ratio of the water to the eutectic solvent is 0.01-10: 1.
5. The preparation method according to claim 1, wherein the molar ratio of the iron source to the barium source in the mixed solution of the barium source, the iron source and the eutectic solvent is 9-12.5: 1.
6. The method of claim 1, wherein the precipitating agent comprises a mixture of sodium carbonate and sodium hydroxide.
7. The preparation method according to claim 6, wherein the molar ratio of the sodium carbonate to the sodium hydroxide is 3-7: 1;
preferably, the precipitant solution is CO3 2-The molar concentration of (A) is 0.001-0.03 mol/L.
8. The preparation method of claim 1, wherein in the process of carrying out the coprecipitation reaction, the pH of the mixture is controlled to be 7-12.
9. The method according to any one of claims 1 to 8, wherein the temperature of the calcination is 800 to 1200 ℃;
preferably, the calcining time is 0.5-4 h.
10. The barium ferrite is prepared by the preparation method of the barium ferrite as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210569026.2A CN114735754B (en) | 2022-05-24 | 2022-05-24 | Barium ferrite and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210569026.2A CN114735754B (en) | 2022-05-24 | 2022-05-24 | Barium ferrite and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114735754A true CN114735754A (en) | 2022-07-12 |
| CN114735754B CN114735754B (en) | 2023-06-16 |
Family
ID=82287691
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210569026.2A Active CN114735754B (en) | 2022-05-24 | 2022-05-24 | Barium ferrite and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114735754B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01100028A (en) * | 1987-06-16 | 1989-04-18 | Ube Ind Ltd | Barium ferrite magnetic powder and production thereof |
| CN102485692A (en) * | 2010-12-06 | 2012-06-06 | 沈阳理工大学 | Preparation method of two-dimensional sheet-shaped barium ferrite |
| CN102491304A (en) * | 2011-12-02 | 2012-06-13 | 罗绍华 | Method for preparing lithium iron phosphate in ionic eutectic mixture |
| CN102660735A (en) * | 2012-03-27 | 2012-09-12 | 上海大学 | Nonaqueous solvent system chemical nickel plating solution, and preparation method and application thereof |
| CN103193472A (en) * | 2013-04-19 | 2013-07-10 | 南通宝聚颜料有限公司 | Method for synthesizing subsphaeroidal barium ferrite superfine powder by using ultrasound-assisted coprecipitation method |
| CN109485099A (en) * | 2018-12-06 | 2019-03-19 | 城口县生产力促进中心 | A method of it is directly that raw material prepares barium ferrite using low-grade witherite |
| CN110246685A (en) * | 2019-07-17 | 2019-09-17 | 徐靖才 | A kind of preparation method of samarium ferromagnetic phase |
| WO2021190110A1 (en) * | 2020-03-25 | 2021-09-30 | 齐鲁工业大学 | Method for preparing microcrystalline cellulose by treating poplar wood powder with deep eutectic solvent combined with acid |
-
2022
- 2022-05-24 CN CN202210569026.2A patent/CN114735754B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01100028A (en) * | 1987-06-16 | 1989-04-18 | Ube Ind Ltd | Barium ferrite magnetic powder and production thereof |
| CN102485692A (en) * | 2010-12-06 | 2012-06-06 | 沈阳理工大学 | Preparation method of two-dimensional sheet-shaped barium ferrite |
| CN102491304A (en) * | 2011-12-02 | 2012-06-13 | 罗绍华 | Method for preparing lithium iron phosphate in ionic eutectic mixture |
| CN102660735A (en) * | 2012-03-27 | 2012-09-12 | 上海大学 | Nonaqueous solvent system chemical nickel plating solution, and preparation method and application thereof |
| CN103193472A (en) * | 2013-04-19 | 2013-07-10 | 南通宝聚颜料有限公司 | Method for synthesizing subsphaeroidal barium ferrite superfine powder by using ultrasound-assisted coprecipitation method |
| CN109485099A (en) * | 2018-12-06 | 2019-03-19 | 城口县生产力促进中心 | A method of it is directly that raw material prepares barium ferrite using low-grade witherite |
| CN110246685A (en) * | 2019-07-17 | 2019-09-17 | 徐靖才 | A kind of preparation method of samarium ferromagnetic phase |
| WO2021190110A1 (en) * | 2020-03-25 | 2021-09-30 | 齐鲁工业大学 | Method for preparing microcrystalline cellulose by treating poplar wood powder with deep eutectic solvent combined with acid |
Non-Patent Citations (2)
| Title |
|---|
| 王二永;罗驹华;: "纳米钡铁氧体制备新进展", vol. 42, no. 08, pages 42 - 45 * |
| 郭豪;刘玉存;刘登程;王建华;: "M型钡铁氧体制备的工艺优选", vol. 31, no. 07, pages 1767 - 1774 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114735754B (en) | 2023-06-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Akhtar et al. | Evaluation of structural, morphological and magnetic properties of CuZnNi (CuxZn0. 5− xNi0. 5Fe2O4) nanocrystalline ferrites for core, switching and MLCI’s applications | |
| Majeed et al. | Structural elucidation and magnetic behavior evaluation of rare earth (La, Nd, Gd, Tb, Dy) doped BaCoNi-X hexagonal nano-sized ferrites | |
| TWI509643B (en) | A strong magnetic particle powder and a method for producing the same, an anisotropic magnet and a bonded magnet | |
| JP6632702B2 (en) | Method for producing Fe-Co alloy powder | |
| Himakar et al. | Effect of Cu substitution on the structural, magnetic, and dc electrical resistivity response of Co0. 5Mg0. 5-x Cu x Fe2O4 nanoferrites | |
| Shang et al. | One-pot in situ molten salt synthesis of octahedral Fe 3 O 4 for efficient microwave absorption application | |
| Li et al. | Rhombic dodecahedral Fe3O4: ionic liquid-modulated and microwave-assisted synthesis and their magnetic properties | |
| Rashad et al. | A novel approach for synthesis of M-type hexaferrites nanopowders via the co-precipitation method | |
| Sapoletova et al. | Plate-like SrFe12O19 particles prepared by modified sol–gel method | |
| EP3780023A1 (en) | Iron-based oxide magnetic powder and method for producing same | |
| Kalaie et al. | Preparation and characterization of superparamagnetic nickel oxide particles by chemical route | |
| Wu et al. | The effect of pH value on strontium hexaferrites: microstructure and magnetic properties | |
| CN104557009A (en) | CoFe2O4-based nano-magnetic composite powder and preparation method thereof | |
| Hue et al. | Synthesis, structure, and magnetic properties of SrFe12O19/La1− xCaxMnO3 hard/soft phase composites | |
| Khudaysh et al. | Analysis of cerium substitution in Co–Sr based spinel ferrites for high frequency application | |
| CN110511013B (en) | La-Ce binary doped barium ferrite wave-absorbing material and preparation method thereof | |
| CN114735754B (en) | Barium ferrite and preparation method thereof | |
| CN103601483B (en) | The synthetic method of lanthanum additive Mn iron strontium oxide magnetic powder | |
| Mudsainiyan et al. | Physico-chemical and magnetic properties of Co-Zr doped Ba-hexaferrites using self combustion and urea assisted method–A comparative study | |
| Polášková et al. | An effect of scandium substitution on the phase purity and structural, magnetic, and electrochemical features of ε-Fe 2 O 3 nanoparticle systems | |
| JP2011132581A (en) | Method for producing nanoparticle of nickel-iron alloy with high saturation magnetization, and nanoparticle of nickel-iron alloy with high saturation magnetization | |
| Guo et al. | Structure and magnetic studies of gadolinium doped M-type barium hexagonal ferrite | |
| Gilani et al. | Morphological and magnetic behavior of neodymium doped LiNi0. 5Fe2O4 nanocrystalline ferrites prepared via micro-emulsion technique | |
| CN114835169B (en) | Spinel type ferrite, preparation method thereof and wave absorbing material | |
| JP2008179841A (en) | Method for producing nickel-iron-molybdenum alloy nanoparticle, and nickel-iron-molybdenum alloy nanoparticle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |