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Preparation method of nano crystal MnZn ferrite with high saturation magnetization intensity

A technology of magnetization and nanocrystals, which is applied in the preparation of nanocrystalline MnZn ferrite with low blocking temperature and high saturation magnetization, which can solve the problems of poor frequency characteristics, low saturation magnetic induction, and low permeability.

Inactive Publication Date: 2011-10-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low saturation magnetic induction, low magnetic permeability and poor frequency characteristics, and propose a higher magnetic permeability, better frequency characteristics, and a larger saturation magnetic induction on the original basis. MnZn Ferrite Material with Increased and Larger Decreased Blocking Temperature

Method used

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  • Preparation method of nano crystal MnZn ferrite with high saturation magnetization intensity
  • Preparation method of nano crystal MnZn ferrite with high saturation magnetization intensity
  • Preparation method of nano crystal MnZn ferrite with high saturation magnetization intensity

Examples

Experimental program
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Embodiment 1

[0056] A preparation method of nanocrystalline MnZn ferrite with high saturation magnetization and low blocking temperature, the preparation method comprises the steps of:

[0057] 1. Prepare the solution (by molar ratio)

[0058] ①, 1.538mol / L Fe, Mn, Zn mixed solution

[0059] Press Fe 2 o 3 :MnO:ZnO=52.8:24.2:13 (mol%), weigh 439.0g of Fe(NO3) 3 9H 2 O, 50% Mn(NO 3 ) 2 Solution 185.0g, 38.7g of Zn(NO 3 ) 2 ·6H 2 O; Dissolve in distilled water and make the volume 1L;

[0060] ②, 1.538mol / L NH 4 HCO 3 the solution

[0061] Weigh 140.8gNH 4 HCO 3 ·H 2 O; Dissolve in distilled water and make the volume 1L;

[0062] ③, 4.0mol / L NaOH solution

[0063] Weigh 160.0g of analytically pure NaOH; dissolve it in distilled water and set the volume to 1L;

[0064] 2. Preparation of nanocrystalline MnZn ferrite powder by phase inversion method

[0065] (1) Measure 2 parts of 50ml of the above-mentioned 1.538mol / L Fe, Mn, Zn mixed solution into a quartz tube and place it in...

Embodiment 2

[0078] The preparation method is the same as that of Example 1, but the magnetic field strength is 2T, and the nanocrystalline MnZn ferrite with high saturation magnetization and low blocking temperature is in the form of powder with a typical spinel structure and the grain size is about 10 nanometers.

Embodiment 3

[0080] The preparation method is the same as in Example 1, but the magnetic field strength is 4 T, and the nanocrystalline MnZn ferrite with high saturation magnetization and low blocking temperature is in the form of powder, with a typical spinel structure, and the grain size is about 10 nanometers. .

[0081] Embodiment 1, 2 and embodiment 3 gained high saturation magnetization, the saturation magnetization of the nanocrystalline MnZn ferrite of low blocking temperature is shown in Fig. 5 (a) with the change of magnetic field, from Figure 5(a) It can be seen that the saturation magnetization increases with the strengthening of the preparation magnetic field, which is because the preparation magnetic field affects the ion occupancy of the ferrite material, which leads to the change of the saturation magnetization.

[0082] The blockage temperature of the nanocrystalline MnZn ferrite with high saturation magnetization and low blockage temperature of embodiment 1, 2 and embodi...

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Abstract

The invention belongs to the technical field of magnetic materials, in particular relates to a preparation method of MnZn ferrite in a magnetic field. The method comprises the following steps: by using a phase conversion method, placing a certain amount of mixed solution of Fe, Mn and Zn metal ions in a 0-6T magnetic field; under the stirring of nitrogen at the speed of 160-260ml / min, controlling the pH value to 9-10, heating to 95 DEG C, and insulating for 3-5 hours; then filtering, washing, and drying at the temperature of 70-90 DGE C, so as to obtain nano crystal MnZn ferrite powder, wherein the obtained powder is a single-phase MnZn ferrite particle and is of a typical spinel structure, the grain size is about 7-11 nanometers, and super paramagnetism is shown within a 40-300K temperature range. The obtained MnZn ferrite material has the advantages that magnetic conductivity is large, frequency characteristic is good, saturation induction density is greatly improved on the original basis, and obstruction temperature is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to a method for preparing nanocrystalline MnZn ferrite with high saturation magnetization and low blocking temperature. Background technique [0002] In the modern information industry, magnetic materials account for a considerable proportion. As early as 2001, the world market of magnetic materials has exceeded 30 billion US dollars, and the output value of global magnetic materials has doubled almost every 10 years since the 1950s. Among them, soft magnetic materials have always been in a dominant position in the total output value. MnZn ferrite (accounting for about 1 / 25 of the global magnetic material share) has high structural symmetry and small crystal magnetic anisotropy, so it has good soft magnetic properties and is widely used in broadband transformers, noise filters, and communications. Transformers, ferromagnetic fluid suspension materials, etc. MnZn ferrite...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/626H01F1/36
Inventor 刘永生钟云波彭麟杨晶晶房文健方津
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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