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Method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics

A room temperature multiferroic and solid solution technology, which is applied in the field of information functional materials, can solve problems such as no records, and achieve the effects of lower phase formation temperature, no need for reducing atmosphere, and short cycle time

Inactive Publication Date: 2013-03-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, the single-phase room temperature multiferroic BiFeO 3 -SrTiO 3 The preparation of solid solution ceramics, and their ferromagnetic and ferroelectric properties at room temperature are not documented in domestic and foreign literature

Method used

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  • Method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics
  • Method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics
  • Method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Preparation of pure BiFeO by sol-gel method using citric acid as complexing agent 3 Ceramics, the first step, weigh 0.04mol citric acid and put it into a 100mL beaker, add 20mL of deionized water, dissolve it under ultrasonic dispersion, and form a transparent solution; weigh 0.02mol bismuth nitrate and add it to the above solution to dissolve under constant stirring , after being dissolved, weigh 0.02mol ferric nitrate and add to the above solution and dissolve. Under the condition of constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged for 5 hours. In the second step, the solution was evaporated to dryness in a water bath at 90° C. to remove moisture, and dried in an oven at 140° C. until a black xerogel was formed. The third step is to grind the dry gel and heat-treat it in the air at 550°C for 5 hours to remove the organic matter to obtain the precursor powder, then grind the precursor powder, press it, and sinter at...

Embodiment 2

[0029] Preparation of 0.9BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.1SrTiO 3Ceramics, in the first step, weigh 0.04mol of citric acid into a 100mL beaker, add 20mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of analytically pure butyl titanate with a graduated straw, Add it to the above citric acid solution under constant stirring, add it to the above citric acid solution in turn, and disperse it ultrasonically for 30 minutes to form a transparent solution; then, weigh 0.02 mol of strontium nitrate, add it to the above solution to dissolve, add deionized water to obtain 40ml solution to become A solution. In the second step, weigh 0.04mol of citric acid and put it into a 100mL beaker, add 20mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of bismuth nitrate and add it to the above solution to dissolve under constant stirring, a...

Embodiment 3

[0032] Preparation of 0.8BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.2SrTiO 3 Ceramics, in the first step, weigh 0.04mol of citric acid into a 100mL beaker, add 20mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of analytically pure butyl titanate with a graduated straw, Add it to the above citric acid solution under constant stirring, add it to the above citric acid solution in turn, and disperse it ultrasonically for 30 minutes to form a transparent solution; then, weigh 0.02 mol of strontium nitrate, add it to the above solution to dissolve, add deionized water to obtain 40ml solution to become A solution. In the second step, weigh 0.04mol of citric acid and put it into a 100mL beaker, add 20mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of bismuth nitrate and add it to the above solution to dissolve under constant stirring, ...

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Abstract

The invention discloses a method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics, belonging to the technical field of information functional materials. The BiFeO3-SrTiO3 ceramics prepared by using the method have the advantages of single-phase structure, low drain current, room-temperature ferroelectric / ferromagnetic coexistence, and the like.

Description

technical field [0001] The invention belongs to the technical field of information functional materials. Background technique [0002] With the continuous development of information technology and the miniaturization and multifunctionalization of devices, people's research interest in multifunctional materials with both current collecting and magnetic properties is increasing. Multiferroic materials not only have a single ferroelectricity, ferromagnetism and other properties, but also in this material, the electric polarization and magnetization can be coupled to each other to produce new functions, such as the magnetoelectric coupling effect, that is, the material produces ferroelectricity under an external magnetic field. Polarization, or the property of generating magnetic polarization under an external electric field. This has greatly broadened the application range of ferrous materials, and thus has received widespread attention. American Science magazine predicted in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/624
Inventor 袁松柳马争争田召明李建青
Owner HUAZHONG UNIV OF SCI & TECH
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