CN108069460B - Preparation method of rod-shaped tin dioxide/barium ferrite composite material - Google Patents

Preparation method of rod-shaped tin dioxide/barium ferrite composite material Download PDF

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CN108069460B
CN108069460B CN201711322524.2A CN201711322524A CN108069460B CN 108069460 B CN108069460 B CN 108069460B CN 201711322524 A CN201711322524 A CN 201711322524A CN 108069460 B CN108069460 B CN 108069460B
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barium ferrite
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tin dioxide
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杨海波
戴菁菁
文博
林营
王雷
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Shaanxi University of Science and Technology
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    • C01G49/00—Compounds of iron
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Abstract

A preparation method of a rod-shaped stannic oxide/barium ferrite composite material comprises the steps of dissolving stannic chloride pentahydrate and sodium hydroxide in deionized water, and stirring and dissolving to obtain a solution A; adding the flaky barium ferrite powder into the solution A, adding a surfactant after ultrasonic dispersion, uniformly stirring, putting into a homogeneous reactor, and reacting at 180-200 ℃ for 12-24 h to obtain the rod-shaped tin dioxide/barium ferrite composite material. The preparation process is simple, the process is controllable, the cost is low, the obtained rod-shaped tin dioxide/barium ferrite binary composite material has the advantages of high Curie temperature, high coercivity, chemical stability, corrosion resistance and the like of (001) oriented growth barium ferrite and the characteristics of high carrier mobility of tin dioxide and the like, and is applied to various fields of magnetic recording media, sensors, microwave absorbing materials and the like.

Description

Preparation method of rod-shaped tin dioxide/barium ferrite composite material
Technical Field
The invention belongs to the field of material science, and relates to a preparation method of a rod-shaped tin dioxide/barium ferrite composite material.
Background
Because of the high magnetocrystalline anisotropy and the equivalent field of saturation magnetization, people often effectively improve the wave-absorbing performance of ferrite wave-absorbing materials by an element substitution method, and the ferrite wave-absorbing materials have low price and abundant earth reserves, and become one of important absorbing materials. Spinel ferrites have developed rapidly and have achieved considerable scientific research since the beginning of the middle of the 20 th century, but there are reasons why the use of spinel ferrites in the high frequency range is greatly limited; therefore, the most studied magnetic ferrite material in the high frequency field is a magnetoplumbite type ferrite material. M-type barium ferrite is the most representative of magnetoplumbite-type ferrites in the current research. Barium ferrite is cheap in raw materials, excellent in chemical stability and oxidation resistance, has high coercive force, magnetic energy product, uniaxial magnetocrystalline anisotropy and moderate magnetization intensity, and has limited application due to the defects of high density, poor high-temperature characteristics and the like. The single barium ferrite is difficult to meet the requirements of lightness, thinness, width and strength, but has larger relative magnetic permeability and smaller dielectric constant, and the wave absorbing performance of the barium ferrite is improved by compounding with other materials. The tin dioxide is a wide-bandgap n-type metal oxide semiconductor, is a very important semiconductor functional material, has better high-frequency microwave absorption performance, and can effectively widen the wave-absorbing frequency band of the composite material.
In the existing report, Chen et al prepared the zinc oxide coated M-type barium ferrite composite material by a coprecipitation method and a self-propagating high-temperature synthesis method; korean et al prepared a granular ferriferrous oxide/barium ferrite composite material by a hydrothermal method. The composite material of metal oxide and barium ferrite is widely prepared and applied, but the method for preparing rod-shaped metal oxide/barium ferrite is not reported yet.
Disclosure of Invention
The invention aims to provide a preparation method of a rod-shaped tin dioxide/barium ferrite composite material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of a rod-shaped tin dioxide/barium ferrite composite material comprises the following steps:
1) dissolving tin chloride pentahydrate and sodium hydroxide in deionized water, and stirring and dissolving to obtain a solution A;
2) adding the flaky barium ferrite powder into the solution A, adding a surfactant after ultrasonic dispersion, and uniformly stirring to obtain a solution B;
3) and pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, putting the kettle into a homogeneous reactor, and reacting for 12-24 hours at 180-200 ℃ to obtain the rod-shaped tin dioxide/barium ferrite composite material.
In a further development of the invention, the tin tetrachloride pentahydrate and the sodium hydroxide are in accordance with Sn4+With OH-The molar ratio is 1: (9-12) dissolving in deionized water.
The further improvement of the invention is that the ratio of the tin tetrachloride pentahydrate to the deionized water is (1-1.5) mmol: 10 mL.
The invention has the further improvement that the ultrasonic power is 600W, and the time is 5-10 min.
A further improvement of the invention is that the surfactant is sodium lauryl sulfate.
The further improvement of the invention is that the stirring speed in the step 2) is 450-550 r/min, and the stirring time is 30 min.
The further improvement of the invention is that the molar ratio of the flaky barium ferrite powder to the surfactant is (2-5): 1.
the further improvement of the invention is that the molar ratio of the flaky barium ferrite powder to the stannic chloride pentahydrate is 1: 10.
the invention is further improved in that the flaky barium ferrite powder is prepared by a molten salt method.
Compared with the prior art, the invention has the following beneficial effects: the invention prepares the rod-shaped stannic oxide/barium ferrite composite material by a hydrothermal method, and SnO is microscopically2The nano-rods are orderly and closely arranged in BaFe12O19The surface of the flaky powder. High quantities of SnO2The nano-rods are coated on the surface of the barium ferrite to obtain a porous sheet, which is more favorable for the absorption of electromagnetic waves compared with the coating of particles and sheets. The rod-shaped tin dioxide/barium ferrite composite material obtained by the invention has the advantages of high Curie temperature, high coercivity, chemical stability, corrosion resistance and the like of (001) oriented growth barium ferrite and the characteristics of high carrier mobility and the like of tin dioxide, and is applied to various fields such as magnetic recording media, sensors, microwave absorbing materials and the like. The invention has the advantages of simple equipment, stable process, continuous operation, high production efficiency, high automation, low cost, good material uniformity and simple preparation method.
Furthermore, the invention adopts a molten salt discharge method to prepare the flaky barium ferrite powder, which is beneficial to BaFe12O19The crystal grains are enlarged and aligned in the (001) plane orientation. BaFe in rod-like stannic oxide/barium ferrite composite material12O19The mass percentage of the composite material is 5-15%, and the wave-absorbing performance is excellent.
Drawings
FIG. 1 shows BaFe prepared by molten salt method in example 1 of the present invention12O19XRD pattern of the powder.
FIG. 2 is a hydrothermal process of example 1 of the present inventionSnO of2/BaFe12O19XRD pattern of the composite.
FIG. 3 shows BaFe prepared by molten salt method in example 1 of the present invention12O19SEM image of powder.
FIG. 4 shows a hydrothermal process of SnO prepared in example 1 of the present invention2/BaFe12O19SEM image of the composite material.
FIG. 5 shows a hydrothermal process of SnO prepared in example 1 of the present invention2/BaFe12O19High magnification SEM image of the composite.
FIG. 6 is a view showing that SnO prepared by hydrothermal method according to comparative example 1 of the present invention was changed in the amount of added surfactant2/BaFe12O19SEM image of the composite material.
FIG. 7 shows a hydrothermal SnO prepared according to comparative example 1 of the present invention after changing the amount of added surfactant2/BaFe12O19Low-magnification SEM images of the composite.
FIG. 8 is a view showing that SnO prepared by hydrothermal method according to comparative example 1 of the present invention was changed in the amount of added surfactant2/BaFe12O19High magnification SEM image of the composite.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments in conjunction with the accompanying drawings.
The preparation of the flaky barium ferrite powder is disclosed in CN 106696410A, and the specific preparation process is as follows:
1) according to the chemical formula BaFe12O19In the molar ratio of (1) BaCO3With Fe2O3Mixing, adding molten salt, ball-milling, drying, and sieving with 60 mesh sieve to obtain mixed powder A1；
2) Mixing the powder A obtained in the step 1)1Calcining to obtain BaFe12O19Precursor B of powder1；
3) According to the chemical formula BaFe12O19In a molar ratio of Fe2O3And BaCl2·2H2Mixing O, and then adding BaFe obtained in the step 2)12O19Precursor B of powder1And molten salt, ball milling and mixing uniformly, (the molten salt is BaCl)2·2H2O，BaFe12O19Precursor B of powder1Equivalent to the template action, added to BaCl2·2H2O and Fe2O3Mixing and ball milling) to obtain mixed slurry, drying the mixed slurry, and sieving with a 60-mesh sieve to obtain mixed powder C1Then mixing the powder C1Calcining to obtain BaFe with orientation in (001) direction12O19Flake powder, namely flake barium ferrite powder.
Wherein, BaCO in the step 1)3With Fe2O3The mass ratio of the total mass to the molten salt is 1: (1-2);
the fused salt in the step 1) is NaCl.
The calcining temperature in the step 2) is 1050-1150 ℃, and the time is 2-5 h.
BaCl in step 3)2·2H2O and Fe2O3The mass ratio of (2-3): 1. (BaCl here)2·2H2The amount of O comprises BaFe by the formula12O19In addition to the calculated molar ratio, the molten salt BaCl is also included2·2H2O, i.e. BaCl in the mixed powder2·2H2O total amount)
The calcining temperature in the step 3) is 1050-1200 ℃, and the time is 5-8 h.
Example 1
A rod-shaped stannic oxide/barium ferrite composite material has a chemical expression of SnO2/BaFe12O19The method comprises the following steps:
(1) production of BaFe having orientation in (001) direction by molten salt method12O19Flake powder. According to the chemical formula BaFe12O19The mole ratio of the raw materials is that BaCO is accurately and respectively weighed by an electronic balance3And Fe2O3Adding NaCl after mixing, placing in a 200mL ball milling tank, fully ball milling for 4h, uniformly mixing, and then placing the mixed slurry in an electric heating forced air drying ovenAnd (5) drying. Wherein BaCO3、Fe2O3The mass ratio of the total mass to NaCl is 1:1, the mass ratio of materials, balls and water used for ball milling is 1:2:1, the rotation speed of the ball mill is 400r/min, the mixture is dried for 8 hours at the temperature of 60 ℃ in an electric heating blowing drying oven, and the dried mixture is sieved by a 60-mesh sieve to obtain mixed powder A1。
(2) Firstly, the mixed powder A obtained in the step (1)1Presintering in a high temperature muffle furnace at 1150 deg.C for 2h, washing the obtained presintering product with ultrapure water at 80 deg.C until NaCl is washed to obtain BaFe12O19Precursor B of powder1。
(3) According to the chemical formula BaFe12O19The mole ratio of Fe is accurately weighed by an electronic balance and Fe is added2O3And BaCl2·2H2Mixing O, and adding BaFe obtained in the step 212O19Precursor B1And molten salt, ball-milling for 4h, uniformly mixing, then placing the mixed slurry in an electric heating forced air drying oven, drying at 80 ℃ for 8h, and sieving with a 60-mesh sieve after drying to obtain mixed powder C1Mixing the powder C1Placing in a high-temperature muffle furnace, and pre-burning at 1050 deg.C for 8h to obtain BaFe with orientation in (001) direction12O19Flake powder, namely flake barium ferrite powder. (wherein, Fe)2O3With BaCl2·2H2The ratio of the total mass of O is 1:1, the molten salt is BaCl2·2H2O。BaFe12O19Precursor B of powder1Is BaCl2·2H2O、Fe2O3Molten salt and BaFe12O19Precursor B of powder15% of the total mass);
(4) by Sn4+With OH-The molar ratio is 1: dissolving stannic chloride pentahydrate and sodium hydroxide in 35mL of deionized water, and stirring and dissolving to obtain a solution A; the ratio of tin tetrachloride pentahydrate to deionized water was 1 mmol: 10 mL.
(5) Adding 50mg of flaky barium ferrite powder into the solution A, performing ultrasonic dispersion for 10min by adopting a 600W ultrasonic machine, stirring for half an hour at the rotating speed of 450r/min, adding sodium dodecyl sulfate, and stirring to obtain a solution B; the mol ratio of the flaky barium ferrite powder to the lauryl sodium sulfate is 5: 1; the mol ratio of the flaky barium ferrite powder to the tin tetrachloride pentahydrate is 1: 10;
(6) pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, sealing, controlling the filling ratio within 60%, putting into a homogeneous reactor, and reacting for 24h at 200 ℃.
(7) After the reaction is finished, respectively centrifugally washing the mixture for 3 times by deionized water and absolute ethyl alcohol, and drying the mixture for 6 hours in an oven at the temperature of 60 ℃ to obtain the rod-shaped tin dioxide/barium ferrite composite material.
BaFe prepared from FIG. 112O19It can be seen that no hetero-phase is generated and the growth is oriented in the (001) direction.
It can be observed from FIG. 2 that the prepared rod-shaped SnO2/BaFe12O19Only BaFe in the composite powder12O19And SnO2No hetero-phase is generated; further, BaFe12O19The diffraction peak intensity of (A) is greatly reduced, indicating that SnO2Tightly coated with BaFe12O19The above.
As can be seen from FIG. 3, BaFe was prepared12O19The crystal grains are hexagonal sheets, the surfaces of the grains are smooth, the side length is about 30 mu m, and the thickness is 2-7 mu m.
As can be observed from FIGS. 4 and 5, BaFe12O19Surface coated with SnO2Uniformly coated in porous BaFe12O19SnO without separate scattering2And (3) granules.
Example 2
A rod-shaped stannic oxide/barium ferrite composite material has a chemical expression of SnO2/BaFe12O19The method comprises the following steps:
(1) production of BaFe having orientation in (001) direction by molten salt method12O19Flake powder. According to the chemical formula BaFe12O19The mole ratio of the raw materials is that BaCO is accurately and respectively weighed by an electronic balance3And Fe2O3And adding NaCl after mixing, placing in a 200mL ball milling tank, fully ball milling for 4h, uniformly mixing, and then placing the mixed slurry in an electric heating forced air drying oven for drying. Wherein BaCO3、Fe2O3The mass ratio of the total mass to NaCl is 1:2, the mass ratio of the materials, the balls and the water used for ball milling is 1:2:1, the rotation speed of the ball mill is 450r/min, the mixture is dried for 8 hours at the temperature of 60 ℃ in an electric heating blowing drying oven, and the dried mixture is sieved by a 60-mesh sieve to obtain mixed powder A1。
(2) Firstly, the mixed powder A obtained in the step 11Presintering in a high temperature muffle furnace at 1100 deg.C for 4h, washing the obtained presintering product with ultrapure water at 80 deg.C until NaCl is washed to obtain BaFe12O19Precursor B of powder1。
(3) According to the chemical formula BaFe12O19The mole ratio of Fe is accurately weighed by an electronic balance and Fe is added2O3And BaCl2·2H2Mixing O, and adding BaFe obtained in the step 212O19Precursor B1And molten salt, ball-milling for 4h, uniformly mixing, then placing the mixed slurry in an electric heating forced air drying oven, drying at 80 ℃ for 8h, and sieving with a 60-mesh sieve after drying to obtain mixed powder C1Mixing the powder C1Placing in a high-temperature muffle furnace for pre-sintering at 1100 ℃ for 6h to obtain BaFe with orientation in the (001) direction12O19Flake powder. (wherein, Fe)2O3With BaCl2·2H2The ratio of the total mass of O is 1:2, the molten salt is BaCl2·2H2O。BaFe12O19Precursor B of powder1Is BaCl2·2H2O、Fe2O3Molten salt and BaFe12O19Precursor B of powder15% of the total mass);
(4) by Sn4+With OH-The molar ratio is 1: 9, dissolving stannic chloride pentahydrate and sodium hydroxide in 30mL of deionized water, and stirring and dissolving to obtain a solution A; the ratio of tin tetrachloride pentahydrate to deionized water was 1.5 mmol: 10 mL;
(5) adding 50mg of flaky barium ferrite powder into the solution A, performing ultrasonic dispersion for 10min by adopting a 600W ultrasonic machine, stirring for half an hour at the rotating speed of 450r/min, adding sodium dodecyl sulfate, and stirring to obtain a solution B; the mol ratio of the flaky barium ferrite powder to the lauryl sodium sulfate is 2: 1; the molar ratio of the flaky barium ferrite powder to the tin tetrachloride pentahydrate is 1: 10;
(6) pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, sealing, controlling the filling ratio within 60%, putting into a homogeneous reactor, and reacting for 24h at 180 ℃.
(7) After the reaction is finished, respectively centrifugally washing the mixture for 3 times by deionized water and absolute ethyl alcohol, and drying the mixture for 6 hours in an oven at the temperature of 60 ℃ to obtain the rod-shaped tin dioxide/barium ferrite composite material.
Tests prove that the prepared rod-shaped tin dioxide/barium ferrite composite material has excellent wave-absorbing performance in the range of 2-18 GHz.
Example 3
A rod-shaped stannic oxide/barium ferrite composite material has a chemical expression of SnO2/BaFe12O19The method comprises the following steps:
(1) production of BaFe having orientation in (001) direction by molten salt method12O19Flake powder. According to the chemical formula BaFe12O19The mole ratio of the raw materials is that BaCO is accurately and respectively weighed by an electronic balance3And Fe2O3And adding NaCl after mixing, placing in a 200mL ball milling tank, fully ball milling for 4h, uniformly mixing, and then placing the mixed slurry in an electric heating forced air drying oven for drying. Wherein BaCO3、Fe2O3The mass ratio of the total mass to NaCl is 1:2, the mass ratio of the materials, the balls and the water used for ball milling is 1:2:1, the rotating speed of the ball mill is 450r/min, the mixture is dried for 8 hours at the temperature of 60 ℃ in an electric heating blast drying oven, and the dried mixture is sieved by a 60-mesh sieve to obtain mixed powder A1。
(2) Firstly, the mixed powder A obtained in the step 11Presintering in a high temperature muffle furnace at 1050 deg.C for 5 hr, washing the obtained presintering product with ultrapure water at 80 deg.C until NaCl is washedCleaning to obtain BaFe12O19Precursor B of powder1。
(3) According to the chemical formula BaFe12O19The mole ratio of Fe is accurately weighed by an electronic balance and Fe is added2O3And BaCl2·2H2Mixing O, and adding BaFe obtained in the step 212O19Precursor B1And molten salt, ball-milling for 4h, uniformly mixing, then placing the mixed slurry in an electric heating forced air drying oven, drying at 80 ℃ for 8h, and sieving with a 60-mesh sieve after drying to obtain mixed powder C1Mixing the powder C1Placing in a high-temperature muffle furnace for preburning at 1200 ℃ for 5h to obtain BaFe with orientation in the (001) direction12O19Flake powder. (wherein, Fe)2O3With BaCl2·2H2The total mass ratio of O is 1:1, and the molten salt is BaCl2·2H2O。BaFe12O19Precursor B of powder1Is BaCl2·2H2O、Fe2O3Molten salt and BaFe12O19Precursor B of powder15% of the total mass);
(4) by Sn4+With OH-The molar ratio is 1: 11, dissolving stannic chloride pentahydrate and sodium hydroxide in 35mL of deionized water, and stirring and dissolving to obtain a solution A; the ratio of tin tetrachloride pentahydrate to deionized water was 1 mmol: 10 mL;
(5) adding 50mg of flaky barium ferrite powder into the solution A, performing ultrasonic dispersion for 10min, performing ultrasonic dispersion for 5min by using a 600W ultrasonic machine, stirring at the rotating speed of 500r/min for half an hour, adding sodium dodecyl sulfate, and stirring to obtain a solution B; the mol ratio of the flaky barium ferrite powder to the lauryl sodium sulfate is 3: 1; the molar ratio of the flaky barium ferrite powder to the tin tetrachloride pentahydrate is 1: 10;
(6) pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, sealing, controlling the filling ratio within 60%, putting into a homogeneous reactor, and reacting for 20h at 190 ℃.
(7) After the reaction is finished, respectively centrifugally washing the mixture for 3 times by deionized water and absolute ethyl alcohol, and drying the mixture for 6 hours in an oven at the temperature of 60 ℃ to obtain the rod-shaped tin dioxide/barium ferrite composite material.
Tests prove that the prepared rod-shaped tin dioxide/barium ferrite composite material has excellent wave-absorbing performance in the range of 2-18 GHz.
Example 4
A rod-shaped stannic oxide/barium ferrite composite material has a chemical expression of SnO2/BaFe12O19The method comprises the following steps:
(1) production of BaFe having orientation in (001) direction by molten salt method12O19Flake powder. According to the chemical formula BaFe12O19The mole ratio of the raw materials is that BaCO is accurately and respectively weighed by an electronic balance3And Fe2O3And adding NaCl after mixing, placing in a 200mL ball milling tank, fully ball milling for 4h, uniformly mixing, and then placing the mixed slurry in an electric heating forced air drying oven for drying. Wherein BaCO3、Fe2O3The mass ratio of the total mass of the powder A to the NaCl is 1:2, the mass ratio of the materials, the balls and the water used for ball milling is 1:2:1, the rotating speed of the ball mill is 500r/min, the powder is dried in an electrothermal blowing dry box for 8 hours at the temperature of 60 ℃, and the dried powder is sieved by a 60-mesh sieve to obtain mixed powder A1。
(2) Firstly, the mixed powder A obtained in the step 11Presintering in a high-temperature muffle furnace at 1050 ℃ for 3h, washing the obtained presintering product with ultrapure water at 80 ℃ until NaCl is washed clean, and obtaining BaFe12O19Precursor B of powder1。
(3) According to the chemical formula BaFe12O19The mole ratio of Fe is accurately weighed by an electronic balance and Fe is added2O3And BaCl2·2H2Mixing O, and adding BaFe obtained in the step 212O19Precursor B1And molten salt, ball-milling for 4h, uniformly mixing, then placing the mixed slurry in an electric heating forced air drying oven, drying at 80 ℃ for 8h, and sieving with a 60-mesh sieve after drying to obtain mixed powder C1Mixing the powder C1Pre-burning at 1150 deg.C for 5 hr in a high temperature muffle furnace to obtain a sheet having a (001) orientationOriented BaFe12O19Flake powder. (wherein, Fe)2O3With BaCl2·2H2The total mass ratio of O is 1:3, and the molten salt is BaCl2·2H2O。BaFe12O19Precursor B of powder1Is BaCl2·2H2O、Fe2O3Molten salt and BaFe12O19Precursor B of powder15% of the total mass);
(4) by Sn4+With OH-The molar ratio is 1: 12, dissolving tin tetrachloride pentahydrate and sodium hydroxide in 35mL of deionized water, and stirring and dissolving to obtain a solution A; the ratio of tin tetrachloride pentahydrate to deionized water was 1 mmol: 10 mL;
(5) adding 50mg of flaky barium ferrite powder into the solution A, performing ultrasonic dispersion for 10min, performing ultrasonic dispersion for 5min by using a 600W ultrasonic machine, stirring at the rotating speed of 550r/min for half an hour, adding sodium dodecyl sulfate, and stirring to obtain a solution B; the mol ratio of the flaky barium ferrite powder to the lauryl sodium sulfate is 2: 1; the molar ratio of the flaky barium ferrite powder to the tin tetrachloride pentahydrate is 1: 10;
(6) pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, sealing, controlling the filling ratio within 60%, putting into a homogeneous reactor, and reacting for 12h at 200 ℃.
(7) After the reaction is finished, respectively centrifugally washing the mixture for 3 times by deionized water and absolute ethyl alcohol, and drying the mixture for 6 hours in an oven at the temperature of 60 ℃ to obtain the rod-shaped tin dioxide/barium ferrite composite material.
Tests prove that the prepared rod-shaped tin dioxide/barium ferrite composite material has excellent wave-absorbing performance in the range of 2-18 GHz.
Comparative example 1
Different from the embodiment, in the step (5), the molar ratio of the flaky barium ferrite powder to the surfactant is 10: 1; other conditions were the same as in example 1.
As can be seen from FIG. 6, SnO was prepared2/BaFe12O19Only BaFe in the composite powder12O19And SnO2No hetero-phase is generated; phase (C)In comparison with rod-shaped SnO2/BaFe12O19The diffraction peak intensity of (a) is small.
As can be seen from fig. 7 and 8, no rod-like tin dioxide appears on the surface of the barium ferrite, but irregularly shaped nanoparticles.

Claims (6)

1. A preparation method of a rod-shaped tin dioxide/barium ferrite composite material is characterized by comprising the following steps:
1) dissolving tin chloride pentahydrate and sodium hydroxide in deionized water, and stirring and dissolving to obtain a solution A; wherein, the stannic chloride pentahydrate and the sodium hydroxide are according to Sn4+With OH-The molar ratio is 1: (9-12) dissolving in deionized water;
2) adding the flaky barium ferrite powder into the solution A, adding a surfactant after ultrasonic dispersion, and uniformly stirring to obtain a solution B; wherein, the flaky barium ferrite powder is prepared by a molten salt method; the surfactant is sodium dodecyl sulfate;
3) pouring the solution B into a polytetrafluoroethylene hydrothermal kettle, putting the kettle into a homogeneous reactor, and reacting for 12-24 hours at 180-200 ℃ to obtain a rod-shaped tin dioxide/barium ferrite composite material; BaFe in rod-like stannic oxide/barium ferrite composite material12O19The mass percentage of the component (A) is 5-15%.
2. The preparation method of the rod-shaped tin dioxide/barium ferrite composite material according to claim 1, wherein the ratio of the tin tetrachloride pentahydrate to the deionized water is (1-1.5) mmol: 10 mL.
3. The preparation method of the rod-shaped tin dioxide/barium ferrite composite material according to claim 1, wherein the ultrasonic power is 600W, and the time is 5-10 min.
4. The preparation method of the rod-shaped tin dioxide/barium ferrite composite material according to claim 1, wherein the stirring speed in the step 2) is 450-550 r/min, and the stirring time is 30 min.
5. The preparation method of the rod-shaped tin dioxide/barium ferrite composite material according to claim 1, wherein the molar ratio of the sheet-shaped barium ferrite powder to the surfactant is (2-5): 1.
6. the preparation method of the rod-shaped tin dioxide/barium ferrite composite material according to claim 1, wherein the molar ratio of the sheet-shaped barium ferrite powder to the tin tetrachloride pentahydrate is 1: 10.
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