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Cr-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof

A technology of multiferroic ceramics and bi2fe4o9, which is applied in the field of transition metal doped Bi2Fe4O9 multiferroic ceramic materials and its preparation, can solve the problems that there are no reports on multiferroic ceramic materials, and achieve low cost, low leakage current, and preparation The effect of simple process

Inactive Publication Date: 2015-04-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the citric acid-nitrate sol-gel self-propagating combustion reaction method is used to prepare Cr-doped Bi 2 Fe 4 o 9 There is no report on multiferroic ceramic materials

Method used

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  • Cr-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • Cr-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof
  • Cr-doped Bi2Fe4O9 multiferroic ceramic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Bi 2 Fe 4(4-x) Cr 4x o 9 (x=0) Multiferroic ceramics. In the first step, weigh 0.02mol of bismuth nitrate and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.04mol of ferric nitrate and add it to the above solution under constant stirring, After being dissolved, weigh 0.06mol of citric acid and add it to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid to the sum of the above two metals is 1 :1. In the second step, under constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 11 hours. Then, evaporate the solution to dryness in a water bath at 100°C to obtain the corresponding gel, and dry it in an oven at 170°C until a xerogel is formed; glue, causing it to undergo self-propagating combustion...

Embodiment 2

[0025] Bi 2 Fe 4(4-x) Cr 4x o 9 (x=0.02) Multiferroic ceramics. In the first step, weigh 0.02mol of bismuth nitrate and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.0392mol of ferric nitrate and 0.0008mol of chromium nitrate respectively under constant stirring Add it into the above solution, and after it dissolves, weigh 0.06mol citric acid and add it to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid is the same as that of the above three metals and the molar ratio is 1:1. In the second step, under constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 11 hours. Then, evaporate the solution to dryness in a water bath at 100°C to obtain the corresponding gel, and dry it in an oven at 170°C until...

Embodiment 3

[0028] Bi 2 Fe 4(4-x) Cr 4x o 9 (x=0.04) Multiferroic ceramics. In the first step, weigh 0.02mol of bismuth nitrate and put it into a 100mL beaker, add 30mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; then weigh 0.0384mol of ferric nitrate and 0.0016mol of chromium nitrate respectively under constant stirring Add it into the above solution, and after dissolving, weigh 0.06mol citric acid and add it to the above solution and dissolve; under ultrasonic dispersion, add 8ml of ethylene glycol to form a transparent solution; wherein, the molar ratio of citric acid is the same as that of the above three metals and the molar ratio is 1:1. In the second step, under constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged in a water bath for 11 hours. Then, evaporate the solution to dryness in a water bath at 100°C to obtain the corresponding gel, and dry it in an oven at 170°C until a...

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Abstract

The invention discloses a Cr-doped Bi2Fe4O9 multiferroic ceramic material and a preparation method thereof. The preparation method comprises the step of carrying out high temperature annealing treatment by adopting a citric acid-nitrate sol gel self-propagating combustion reaction method to obtain the multiferroic ceramic material with a molecular formula of Bi2Fe4(4-x)Cr4xO9 (x is more than 0 and less than or equal to 0.08). The Cr-doped Bi2Fe4O9 multiferroic ceramic material has a single-phase structure, low leakage current and multiferroic property at room temperature and magnetic property and ferroelectricity of the material can be regulated by changing the doping content of Cr; and a preparation technology is simple, cost is low, no reducing atmosphere is required, and environmental protection, no toxicity and no pollution are achieved.

Description

technical field [0001] The invention belongs to the technical field of multiferroic ceramic materials, in particular to a transition metal doped Bi 2 Fe 4 o 9 Multiferroic ceramic material and its preparation method. Background technique [0002] With the development of the information industry, in line with the pursuit of better performance such as high speed, large capacity, and low loss, people have put forward higher and higher requirements for the integration and miniaturization of devices. As a new type of functional material, multiferroic materials integrate ferroelectric and ferromagnetic properties, and there is a magnetoelectric coupling effect between the two. This mutual control of magnetism and electricity is used in information storage, magnetic sensors, and spintronics High-tech fields such as devices, integrated circuits, and capacitor-inductor integrated devices have broad application prospects. [0003] bismuth oxide matrix ceramic material Bi 2 al 4 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 袁松柳席英邱洋黄丽珍
Owner HUAZHONG UNIV OF SCI & TECH
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