CN106518042B - A kind of spinel-type mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide - Google Patents
A kind of spinel-type mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2675—Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/2666—Other ferrites containing nickel, copper or cobalt
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Abstract
It is the soluble-salt aqueous solution by metallic cerium, cobalt and iron by CoFe the invention discloses the preparation method that a kind of spinel-type mixes cerium Nanometer Cobalt Ferrite Oxide2‑xCexO4The stoichiometric ratio of (x=0.1~0.4) mixes, and presses CoFe2‑xCexO4In the molar ratio of total metal ion and citric acid be 1: 1~3 citric acids to be added, adjusting solution ph is 6.0~8.0, and heating is stirred to react to obtain gel, lights generation self-propagating reaction after dry, will obtain after self-propagating reaction product calcining at constant temperature.Nano Co Fe prepared by the present invention2‑xCexO4Ferrite is that as absorbing material ferritic dielectric loss and magnetic loss can be improved in the spinel structure Conjugate ferrite that a kind of cerium dopping amount is higher, crystal phase is single, improves it in the wave-sucking performance of low-frequency range, widens its absorption band.
Description
Technical field
The present invention relates to a kind of ferritic preparations, more particularly to a kind of preparation method of Conjugate ferrite mixed with cerium.
The ferrite prepared in the process of the present invention has the spinel structure of single crystal phase, and at low-frequency range (0~6GHz) with excellent
Absorbing property.
Background technique
In recent years, with the development of microwave technology, including radio telecommunications system, radar, micro-wave oven, mobile phone, medical treatment
The electromagnetic pollutions such as equipment cause the extensive concern of people, and many experts and scholar specially grind the research in this respect, to solve this
A little problems.Nanometer Cobalt Ferrite Oxide (CoFe2O4) it is a kind of material that absorbing property is excellent, not only coercivity with higher, magnetocrystalline
Anisotropy also has good saturation magnetization and biggish magnetostriction, and has electronic isolation, chemical stability
Good and low cost advantage.
But single Conjugate ferrite is not wide enough in the suction wave frequency band of low-frequency range, density is big, as the temperature rises, inhales
Wave performance can weaken.Numerous studies prove, by it is rare earth ion doped can be with the electromagnetic property of Effective Regulation Conjugate ferrite.Due to
Terres rares ion has not pairs of 4f electronics and strong Quantum geometrical phase angular momentum, therefore the whole of Conjugate ferrite can be improved
Body electromagnetic performance, and then improve its absorbing property.
The preparation of rare earth doped Conjugate ferrite and performance have been reported both at home and abroad.Journal of Materials
The rare-earth Sm ion that Processing Technology (2008,98:39-46) reports a kind of sol-gel method synthesis is mixed
Miscellaneous CoFe2O4Nanocrystal, should studies have shown that as Sm ions dosage and temperature are from 400~1000 DEG C of increase, crystal grain
Magnetocrystalline anisotropy and distortion of lattice increase, and lead to the increase of its magnetic property.Rare Metal Materials and
Engineering (2012,41 (S3): 523-526) discloses the Dy doping Conjugate ferrite of collosol and gel self-assembly method synthesis
Magnetic Nano crystal grain should cause the average grain size of cobalt ferrite nanoparticles to become smaller studies have shown that Dy is adulterated, and with Dy
The increase of doping, sample coercivity obviously increase, and specific saturation magnetization declines.This two reports have all referred to rare earth member
The influence of plain (Sm and Dy) to Nanometer Cobalt Ferrite Oxide magnetic property, but do not refer to its shadow to the absorbing property of Nanometer Cobalt Ferrite Oxide
It rings.
Aeronautical material journal (2016,36 (1): 48-52) discloses a kind of doping La3+'s
Ni0.35Co0.15Zn0.5LaxFe2O4The preparation method and absorbing property of absorbing material, the absorbing material 100~300nm of partial size, 1
Within the scope of~12GHz, when x=0.04, thickness of sample are maintained at 3mm or so, at 9.8GHz maximum reflectivity reach-
16.49dB.But the partial size of the material is larger, and small in the loss of low-frequency range (0~6GHz), and reflectivity is low, and absorbing property is poor.
Tianjin Normal University's journal (natural science edition) (2009,29 (1): 36-38), which reports, a kind of uses chemical coprecipitation
The nano Co Fe of method preparation2-xCexO4(x=0~0.3) powder, studies have shown that sample forms list in cerium dopping amount x≤0.2
The one Conjugate ferrite phase with spinel structure, and then Conjugate ferrite phase and CeO when x > 0.22Xiang Bingcun, and cerium dopping amount
There is stronger influence to the magnetic property of sample.Ceramics International (2014,40:5905-5911) reports one
The CoFe that kind is prepared with Sol-Gel auto-combustion method2-xCexO4(x=0,0.01,0.05,0.1,0.15) powder, and point out cerium
Doping and sintering temperature are to influence CoFe2-xCexO4Two principal elements of infrared signature, CoFe1.95Ce0.05O4600
DEG C sintering 2h have highest infrared emitting rate, x > 0.05, sintering temperature be higher than 600 DEG C when, have the second crystal phase CeO2Out
It is existing.Ceramics International (2014,40:447-452) then reports a kind of CoFe prepared with molten-salt growth method2- xCexO4(x=0,0.04,0.08) nano-powder, and influence of the doping of cerium to the quick characteristic of Conjugate ferrite gas propagated sensation is had studied, it ties
Fruit shows as x=0.04, influences on sensor response and running temperature maximum, and there is the second crystal phase CeO in when x=0.082Occur.Instrument
Table technology and sensor (2015, (5): 14-16) report a kind of CoFe prepared with spray heating decomposition2-xCexO4Nanometer
It is uniformly applied to the alumina base plate surface with 2 gold electrodes using screen printing technique and forms sensitive thin film by crystal grain, if
A kind of film-type acetone sensor is counted.With Ce3+Acetone pollutant in vehicle exhaust can be realized for the sensing element of sensitive thin film
On-line checking, but have fluorite phase CeO as x=0.05 (i.e. the wt% of Ce be 3)2Diffraction maximum occurs, and with cerium dopping content
Increase, CeO2Characteristic diffraction peak gradually increases.
It is above-mentioned about in the report for mixing cerium cobalt ferrite material, Ce3+Doping it is all relatively low, and with Ce3+Doping
Increase, all inevitably there is CeO2Second crystal phase cannot form single spinel structure Conjugate ferrite phase.Together
When, these reports have also pertained only to mix influence and sensing capabilities of the cerium to Conjugate ferrite magnetic property and infrared signature
It influences.At present there has been no about the report for mixing influence of the cerium to Conjugate ferrite absorbing property, especially at low-frequency range (0~6GHz)
Absorbing property.
Summary of the invention
The object of the present invention is to provide the preparation methods that a kind of spinel-type mixes cerium Nanometer Cobalt Ferrite Oxide, in the process of the present invention
The nano Co Fe of preparation2-xCexO4The spinel structure of ferrite cerium dopping amount and single crystal phase with higher, using it as suction
Wave material can be improved it in the absorbability of low-frequency range, widen absorption band.
In order to achieve the above objectives, the present invention prepares nano Co Fe using following methods2-xCexO4Ferrite:
1) the soluble-salt aqueous solution of preparing metal cerium, cobalt and iron, is mixed and added into citric acid for each aqueous solution and is mixed
Close solution, wherein the dosage of the soluble-salt of metallic cerium, cobalt and iron meets CoFe2-xCexO4Stoichiometric ratio, the chemistry
X=0.1~0.4 in formula, and CoFe2-xCexO4In the molar ratio of total metal ion and citric acid be 1: 1~3；
2) pH value for adjusting the mixed solution is 6.0~8.0, and 60~90 DEG C are warming up under stirring and is reacted, is reacted
It is 6.0~8.0 that period, which maintains the pH value of mixed solution, until reaction obtains brown gel；
3) gel drying is expanded to obtain sepia xerogel, is crushed, dehydrated alcohol is added, lighted and occur from climing
Prolong reaction；
4) self-propagating reaction product obtains the nano Co Fe of dark brown in 500~900 DEG C of calcining at constant temperature2-xCexO4Iron oxygen
Body.
Wherein, the soluble-salt is nitrate, sulfate or hydrochloride, and present invention preferably uses nitrate.
It is highly preferred that the soluble-salt is configured to the aqueous solution that concentration is 0.2~0.5mol/L by the present invention.
In the present invention, the citric acid can be directly added into the soluble-salt aqueous solution, it can also be by the lemon
Lemon acid is configured to aqueous solution and mixes with the soluble-salt aqueous solution.The concentration of the aqueous citric acid solution preferably 0.8~2mol/
L, more preferably 1.0mol/L.
The present invention adjusts the pH value of mixed solution using concentrated ammonia liquor.Generally, the mass fraction of the concentrated ammonia liquor is 25
~28%.
In the present invention, the dry expansion of the gel preferably carries out in a vacuum drying oven, and specifically the gel exists
80~125 DEG C of 6~10h of dry expansion in vacuum oven.
Self-propagating reaction product is preferably risen to 500~900 DEG C of progress with the heating rate of 10~20 DEG C/min by the present invention
Calcining at constant temperature.
The time of the calcining at constant temperature is 1~4h.
The nano Co Fe prepared with the above method of the present invention2-xCexO4It can be improved low as absorbing material in ferrite
The absorbability of frequency range, widens absorption band.
The nano Co Fe that will be prepared2-xCexO4After ferrite wave-absorbing material grinding, using paraffin as binder, according to
Absorbing material: paraffin=6: 4 mass ratio is uniformly mixed, and after 50~70 DEG C of consolutes, is rapidly injected the circle that thickness of sample is 3mm
Sample test absorbing property in cylindrical mold, after taking solidification.
Fig. 1 gives using the method for the present invention preparation doped with different proportion rare earth ion Ce3+CoFe2-xCexO4 (x
=0,0.1,0.2,0.3,0.4) suction wave profile in 0~6GHz frequency range.As seen from Figure 1, Ce is adulterated3+It is purer afterwards
The absorbing property of Conjugate ferrite has large increase, and effective absorption band is widened, and its absorption peak is mobile to low frequency range.Especially
Work as Ce3+Doping be x=0.3 when, the minimum reflectance at frequency 5030MHz has reached -27.6dB, the frequency less than -5dB
Width is 1.6GHz.
Rare earth ion Ce is prepared using the method for the present invention3+Conjugate ferrite is adulterated, Ce has been obtained3+Doping is high, partial size is small,
The spinel nano CoFe of finely dispersed single crystal phase2-xCexO4Powder, the absorbing property of purer Conjugate ferrite has to be mentioned greatly very much
Height, effective absorption band are widened, and its absorption peak is mobile to low frequency range, has widened the application field of Conjugate ferrite, are ferro-cobalt
Low-frequency range field application of the oxysome in terms of absorbing material opens wide prospect.
Detailed description of the invention
Fig. 1 is CoFe2-xCexO4The suction wave profile of (x=0,0.1,0.2,0.3,0.4).
Fig. 2 is that the X-ray diffraction analysis figure of different samples is composed.
In figure, a CoFe2O4, b CoFe1.7Ce0.3O4。
Fig. 3 is the transmission electron microscope map of different samples.
In figure, a CoFe1.7Ce0.3O4, b CoFe2O4。
Specific embodiment
Following embodiments are only the preferred technical solution of the present invention, are not used to carry out any restrictions to the present invention.For
For those skilled in the art, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made
Any modification, equivalent substitution, improvement and etc., should all be included in the protection scope of the present invention.
Embodiment 1
Weigh Co (NO3)2·6H2O、Fe(NO3)3·9H2O、Ce(NO3)3And citric acid, it is configured to 0.3mol/L nitre respectively
Acidic cobalt solution, 0.3mol/L iron nitrate solution, 0.3mol/L cerous nitrate solution and 1.0mol/L citric acid solution.Measure 20mL nitre
Acidic cobalt solution, 34mL iron nitrate solution, 6mL cerous nitrate solution and 54mL citric acid solution, which pour into 250mL beaker, to be mixed, stirring
Under ammonium hydroxide is slowly added dropwise, adjust the pH value of solution to 7.0.Reaction temperature is adjusted at 70 DEG C, stirring lower isothermal reaction to solution is in
Brown gel, during which per half an hour adjusts the pH value of a solution, makes to be maintained at 7.0.After reaction, gel is anti-
It answers object to be transferred in crucible, is put into vacuum oven, in 100 DEG C of dry expansion 8h, obtain sepia xerogel.It will be in crucible
The xerogel of expansion is smashed to pieces, and a small amount of dehydrated alcohol is added and lights, and self-propagating reaction occurs.Sample after self-propagating reaction is put into horse
Not in furnace, 500 DEG C, calcining at constant temperature 3h are risen to the heating rate of 15 DEG C/min, cooled to room temperature obtains receiving for dark brown
Rice CoFe1.7Ce0.3O4Absorbing material.
Comparative example 1
Weigh Co (NO3)2·6H2O、Fe(NO3)3·9H2O and citric acid, be configured to 0.3mol/L cobalt nitrate solution,
0.3mol/L iron nitrate solution and 1.0mol/L citric acid solution.Measure 20mL cobalt nitrate solution, 40mL iron nitrate solution and
54mL citric acid solution is poured into 250mL beaker and is mixed, and ammonium hydroxide is slowly added dropwise under stirring, adjusts the pH value of solution to 7.0.It adjusts
Reaction temperature stirs lower isothermal reaction to the brown gel of solution, during which per half an hour adjusts a solution at 70 DEG C
PH value makes to be maintained at 7.0.After reaction, gel reactant is transferred in crucible, is put into vacuum oven, in 100
DEG C dry expansion 8h, obtains sepia xerogel.The xerogel expanded in crucible is smashed to pieces, a small amount of dehydrated alcohol is added and lights,
Self-propagating reaction occurs.Sample after self-propagating reaction is put into Muffle furnace, rises to 500 DEG C with the heating rate of 15 DEG C/min,
Calcining at constant temperature 3h, cooled to room temperature obtain the nano Co Fe of dark brown2O4Absorbing material.
Fig. 2 gives embodiment 1 and comparative example 1 prepares the XRD spectrum of sample, and a and b is respectively CoFe in figure2O4With
CoFe1.7Ce0.3O4。
Curve a can be seen that in 2 θ=18.2 ° from Fig. 2, and 30.0 °, 35.4 °, 37.0 °, 43.0 °, 53.4 °, 56.9 °,
62.5 ° and 73.9 ° of characteristic absorption peak respectively with CoFe2O4(111), (220), (311), (222), (400), (422),
(511), (440) are corresponding with (533) crystallographic plane diffraction peak, and complete with PDF standard card (ICDD-JCPDS 01-007-0426)
Unanimously, show that prepared sample is pure spinel structure CoFe2O4.Curve b can be seen that CoFe from Fig. 11.7Ce0.3O4
Diffraction maximum peak position it is consistent with Conjugate ferrite peak position, illustrate Ce3+Incorporation influence the crystal phase of Conjugate ferrite, only Ce3+Generation
For Fe3+It enters in ferritic lattice, does not occur mixing Ce3+Content, which increases, the phenomenon that the second crystal phase occurs.But it adulterates
Ce3+Conjugate ferrite diffraction peak intensity be lower, peak width broadens, the reason is that due to Ce3+Ionic radius ratio Fe3+Ion half
Diameter is big, Ce3+Doping changes the structure of Conjugate ferrite after entering, lead to that crystal form distortion occurs, keep grain growth imperfect, cause
Sample crystallinity reduces.
Fig. 3 is that (a and b are respectively nano Co Fe for the TEM figures of different samples1.7Ce0.3O4And CoFe2O4).It can be with from figure
Find out nano Co Fe1.7Ce0.3O4And CoFe2O4It is partial size is respectively about 60nm and the finely dispersed ferrospinel of 70nm.
The result shows that mixing Ce3+The partial size of Conjugate ferrite is small compared with pure Conjugate ferrite, this is because Ce3+When into lattice, spinelle can be replaced
In occupy the Fe of octahedral site3+, and Ce3+(1.02) radius is compared with Fe3+(0.67) radius is big, so working as Ce3+Replace
Fe3+When will lead to lattice dilatation, and then result in distortion of lattice, the internal stress of generation makes the growth of the particle in solid phase reaction
It is restricted, therefore, the sample particle diameter that rare earth element is added reduces.
Embodiment 2
Weigh Co (NO3)2·6H2O、Fe(NO3)3·9H2O、Ce(NO3)3And citric acid, it is configured to 0.2mol/L nitre respectively
Acidic cobalt solution, 0.2mol/L iron nitrate solution, 0.2mol/L cerous nitrate solution and 1.0mol/L citric acid solution.Measure 30mL nitre
Acidic cobalt solution, 54mL iron nitrate solution, 6mL cerous nitrate solution and 36mL citric acid solution, which pour into 250mL beaker, to be mixed, stirring
Under ammonium hydroxide is slowly added dropwise, adjust the pH value of solution to 8.0.Reaction temperature is adjusted at 60 DEG C, stirring lower isothermal reaction to solution is in
Brown gel, during which per half an hour adjusts the pH value of a solution, makes to be maintained at 8.0.After reaction, gel is anti-
It answers object to be transferred in crucible, is put into vacuum oven, in 90 DEG C of dry expansion 9h, obtain sepia xerogel.It will be in crucible
The xerogel of expansion is smashed to pieces, and a small amount of dehydrated alcohol is added and lights, and self-propagating reaction occurs.Sample after self-propagating reaction is put into horse
Not in furnace, 600 DEG C, calcining at constant temperature 2h are risen to the heating rate of 20 DEG C/min, cooled to room temperature obtains receiving for dark brown
Rice CoFe1.8Ce0.2O4Absorbing material.
Embodiment 3
Weigh Co (NO3)2·6H2O、Fe(NO3)3·9H2O、Ce(NO3)3And citric acid, it is configured to 0.4mol/L nitre respectively
Acidic cobalt solution, 0.4mol/L iron nitrate solution, 0.4mol/L cerous nitrate solution and 1.0mol/L citric acid solution.Measure 20mL nitre
Acidic cobalt solution, 32mL iron nitrate solution, 8mL cerous nitrate solution and 36mL citric acid solution, which pour into 250mL beaker, to be mixed, stirring
Under ammonium hydroxide is slowly added dropwise, adjust the pH value of solution to 5.0.Reaction temperature is adjusted at 60 DEG C, stirring lower isothermal reaction to solution is in
Brown gel, during which per half an hour adjusts the pH value of a solution, makes to be maintained at 5.0.After reaction, gel is anti-
It answers object to be transferred in crucible, is put into vacuum oven, in 125 DEG C of dry expansion 7h, obtain sepia xerogel.It will be in crucible
The xerogel of expansion is smashed to pieces, and a small amount of dehydrated alcohol is added and lights, and self-propagating reaction occurs.Sample after self-propagating reaction is put into horse
Not in furnace, 750 DEG C, calcining at constant temperature 4h are risen to the heating rate of 5 DEG C/min, cooled to room temperature obtains receiving for dark brown
Rice CoFe1.6Ce0.4O4Absorbing material.
Embodiment 4
Weigh Co (NO3)2·6H2O、Fe(NO3)3·9H2O、Ce(NO3)3And citric acid, it is configured to 0.5mol/L nitre respectively
Acidic cobalt solution, 0.5mol/L iron nitrate solution, 0.5mol/L cerous nitrate solution and 1.0mol/L citric acid solution.Measure 20mL nitre
Acidic cobalt solution, 38mL iron nitrate solution, 2mL cerous nitrate solution and 30mL citric acid solution, which pour into 250mL beaker, to be mixed.Stirring
Under ammonium hydroxide is slowly added dropwise, adjust the pH value of solution to 6.0.Reaction temperature is adjusted at 60 DEG C, stirring lower isothermal reaction to solution is in
Brown gel, during which per half an hour adjusts the pH value of a solution, makes to be maintained at 6.0.After reaction, gel is anti-
It answers object to be transferred in crucible, is put into vacuum oven, in 80 DEG C of dry expansion 6h, obtain sepia xerogel.It will be in crucible
The xerogel of expansion is smashed to pieces, and a small amount of dehydrated alcohol is added and lights, and self-propagating reaction occurs.Sample after self-propagating reaction is put into horse
Not in furnace, 500 DEG C, calcining at constant temperature 1h are risen to the heating rate of 16 DEG C/min, cooled to room temperature obtains receiving for dark brown
Rice CoFe1.9Ce0.1O4Absorbing material.
Claims (10)
1. a kind of spinel-type as absorbing material mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, the method includes following steps
It is rapid:
1) the soluble-salt aqueous solution of preparing metal cerium, cobalt and iron, by each aqueous solution be mixed and added into citric acid obtain mixing it is molten
Liquid, wherein the dosage of the soluble-salt of metallic cerium, cobalt and iron meets CoFe2-xCexO4Stoichiometric ratio, in the chemical formula
X=0.2~0.4, and CoFe2-xCexO4In the molar ratio of total metal ion and citric acid be 1: 1~3；
2) pH value for adjusting the mixed solution is 6.0~8.0, and 60~90 DEG C are warming up under stirring and is reacted, during reaction
The pH value for maintaining mixed solution is 6.0~8.0, until reaction obtains brown gel；
3) gel drying is expanded to obtain sepia xerogel, is crushed, dehydrated alcohol is added, it is anti-to light generation self- propagating
It answers；
4) self-propagating reaction product obtains nano Co Fe in 500~900 DEG C of calcining at constant temperature2-xCexO4Ferrite.
2. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that described can
Soluble is nitrate, sulfate or hydrochloride.
3. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that described can
Soluble is nitrate.
4. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that described solvable
Property saline solution concentration be 0.2~0.5mol/L.
5. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that by the lemon
Lemon acid is configured to the aqueous citric acid solution of 0.8~2mol/L, mixes with the soluble-salt aqueous solution.
6. spinel-type according to claim 5 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that the lemon
The concentration of aqueous acid is 1.0mol/L.
7. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that by described solidifying
Glue 80~125 DEG C of 6~10h of dry expansion in a vacuum drying oven.
8. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that by self- propagating
Reaction product rises to 500~900 DEG C of progress calcining at constant temperature with the heating rate of 10~20 DEG C/min.
9. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that the constant temperature
The time of calcining is 1~4h.
10. spinel-type according to claim 1 mixes the preparation method of cerium Nanometer Cobalt Ferrite Oxide, it is characterized in that using quality
Score is the pH value that 25~28% concentrated ammonia liquors adjust mixed solution.
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| CN113353987B (en) * | 2021-07-16 | 2023-10-31 | 中国科学院兰州化学物理研究所 | Spinel type ferrite material doped with rare earth element lanthanum or cerium |
| CN114084910B (en) * | 2021-10-15 | 2023-12-05 | 闽都创新实验室 | Cerium-nickel-cobalt doped ferrite nano material and preparation method and application thereof |
| CN114835169B (en) * | 2022-05-24 | 2023-05-23 | 沈阳理工大学 | Spinel type ferrite, preparation method thereof and wave absorbing material |
| CN115925407A (en) * | 2022-05-25 | 2023-04-07 | 中国科学院赣江创新研究院 | Rare earth element doped Z-type ferrite material and preparation method thereof |
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