Preparation method of Mn-Zn ferrite cobalt-doped nano material

Abstract

The invention relates to a preparation method of a Mn-Zn ferrite cobalt-doped nano material. The method comprises the following steps of: taking a W / O type emulsion formed by cetyltrimethyl ammonium bromide (CTAB) / n-butyl alcohol / isooctane / ferric trichloride, cobalt chloride, zinc sulfate and manganese chloride saline solution as a microreactor, and preparing MnxZnyCo(1-x-y)Fe2O4 by utilizing thereaction of NaOH and a microemulsion. The invention has the advantages that: the homogeneous spinel type ferrite MnxZnyCo(1-x-y)Fe2O4 is directly obtained, the magnetic property of the Mn-Zn ferrite material is improved, and the Mn-Zn ferrite has stronger magnetic property, large coercivity, controllable grain diameter size, even crystal growth, good grain dispersibility, simple operation, good repeatability and fine granularity. The method is carried out under an ordinary pressure, can form different forms of self-assembling bodies by a microemulsion technology, and provides an effectively measure for synthesizing inorganic nano materials with complex structure and special performance.

Description

technical field [0001] The invention belongs to the field of nanotechnology, and relates to a preparation method of a nano manganese zinc cobalt ferrite material. Background technique [0002] Manganese zinc ferrite is a typical soft magnetic material, which is widely used in multi-channel communication, switching power supply, transformer core, filter, various recording heads for recording and video recording, information storage system, medical diagnosis, military industry and civilian use Anti-electromagnetic interference materials, etc. It opens up a broad market for the application of soft ferrite. Its basic requirements are high saturation magnetic induction, high permeability, low loss, low coercive force and high stability. [0003] At present, there is a big gap between my country's MnZn ferrite industry and foreign countries, and the research on improving its performance is both very important and urgent. A large number of documents show that chemical doping to ...

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Problems solved by technology

[0005] chemical co-precipitation method, sol-gel method, citrate gel method, solvothermal method, gas phase reaction method, self-propagating high-temperature synthesis method, high-energy ball milling method, These preparation methods can be used to prepare nanocrystalline ferrite powder, but there are some shortcomings and disadvantages:

[0008]2. The metal alkoxide sol-gel method lacks the metal alkoxide for preparing this type of ferrite for some ferrite types and the cost is high; solvent type, water Parameters such as the ratio to the alkoxide (that is, the amount of water added), the hydrolysis temperature, the type and amount of the catalyst, and the catalytic temperature will all affect the quality of the formed sol, and then affect the performance of the ultrafine powder.

[0009]3. Ferric citrate is difficult to dissolve; powder agglomeration is relatively serious. At present, this method itself is not yet mature, and the shrinkage during the treatment process is large and the residue is small Holes, etc., the biggest disadvantage is high cost and cracking when dry

[0010]4. Most solvothermal methods require high-temperature and high-pressure equipment; the required raw materials are of high purity and high cost, and an autoclave is required in the reaction, and the process is complicated. And there will be other phases, the situation is more complicated

The raw materials are generally organic and toxic. In addition to the difficult disposal of the obtained product, it also pollutes the environment very much and does not meet the development direction of modern industry that meets the requirements of environmental protection.

[0011]5. The gas phase reaction method is not easy to directly generate ferrite nanoparticles; the nano powder prepared by the gas phase method has high purity, small particle size and good monodispersity, but its preparation The shortcomings of complex equipment, high energy consumption and high cost have seriously restricted the application and development of gas phase methods

[0012]6. The high-temperature self-propagating synthesis method requires crushing, grinding, and grading post-processing; it is difficult to form multi-component nanoscale powder; impurities are easily introduced in the process, and the grinding process is usually Lattice defects and lattice distortions will be generated in the material, resulting in a decrease in the magnetic properties of the material

[0013]7. The high-energy ball milling method also has the problems of uneven particle distribution and process pollution, low energy utilization rate, and easy introduction of impurities during the preparation process. The powder particles are large, the distribution is wide, the shape is difficult to control, and the surface treatment is difficult at the same time, etc.

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