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BiFeO3-Bi0.5Na0.5TiO3 base multiferroic solid solution ceramic and preparation method thereof

A solid solution and ceramic technology, applied in the field of information functional materials, can solve the problems of difficult synthesis of single-phase materials, large material leakage current, weak magnetoelectric coupling effect, etc., and achieve the effect of lower phase formation temperature, no need for reducing atmosphere, and simple operation

Inactive Publication Date: 2012-12-26
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few multiferroic materials that can exhibit the coexistence of ferroelectricity and ferromagnetism at room temperature, and the multiferroic materials discovered so far still have the following problems: the Curie temperature and Neel temperature are very low, and the magnetoelectric coupling effect is very weak , the material has a large leakage current, and the single-phase material is difficult to synthesize, which seriously hinders the development of related devices based on multiferroic materials.
So far, single-phase room temperature multiferroic BiFeO 3 -Bi 0.5 Na 0.5 TiO 3 The preparation of solid solution ceramics is not recorded in domestic and foreign literature

Method used

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  • BiFeO3-Bi0.5Na0.5TiO3 base multiferroic solid solution ceramic and preparation method thereof
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  • BiFeO3-Bi0.5Na0.5TiO3 base multiferroic solid solution ceramic and preparation method thereof

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Embodiment 1

[0022] Preparation of pure BiFeO by sol-gel method using citric acid as complexing agent 3 ceramics. In the first 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 while stirring continuously, and wait to dissolve Finally, weigh 0.02mol ferric nitrate and add to the above solution and dissolve. Under the condition of constant stirring, adjust the pH value to 7-7.5 with ammonia water, and age the mixed solution for 3 hours. In the second step, the solution was evaporated to dryness in a water bath at 80° C. to remove moisture, and dried in an oven at 130° C. until a black xerogel was formed. The third step is to grind the dry gel and heat-treat it in the air at 500°C for 4 hours to remove the organic matter to obtain the precursor powder, then grind the precursor powder, press th...

Embodiment 2

[0025] Preparation of 0.9BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.1Bi 0.5 Na 0.5 TiO 3 Ceramics, the first step, weigh 0.04mol citric acid into a 100mL beaker, add 20mL deionized water, dissolve under ultrasonic dispersion to form a transparent solution; use a graduated straw to take 0.02mol analytically pure butyl titanate, Add it into the above citric acid solution under constant stirring, ultrasonically disperse for 30 minutes, and form a transparent solution; then, weigh 0.01mol bismuth nitrate and 0.01mol sodium nitrate, add to the above solution to dissolve, add deionized water to obtain 40ml solution, and become A solution . Weigh 0.04mol of citric acid and put it into another 100mL beaker, add 20mL of deionized water, and dissolve 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. After dissolving, Weigh 0.02mol ferric nitrate an...

Embodiment 3

[0028] Preparation of 0.8BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.2Bi 0.5 Na 0.5 TiO 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 into the above citric acid solution under constant stirring, ultrasonically disperse for 30 minutes, and form a transparent solution; then, weigh 0.01mol bismuth nitrate and 0.01mol sodium nitrate, add to the above solution to dissolve, add deionized water to obtain a 40ml solution, and become A solution. Weigh 0.04mol of citric acid and put it into another 100mL beaker, add 20mL of deionized water, and dissolve 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. After dissolving, Weigh 0.02mol f...

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Abstract

The invention belongs to the technical field of information functional materials and in particular relates to BiFeO3-Bi0.5Na0.5TiO3 base multiferroic solid solution ceramic and a preparation method thereof. The preparation method comprises the following steps of: dissolving bismuth nitrate and ferric nitrate in a citric acid solution to form a transparent BiFeO3 solution; dissolving butyl titanate, bismuth nitrate and sodium nitrate into the citric acid solution to form a transparent Bi0.5Na0.5TiO3 solution; mixing the BiFeO3 solution and the Bi0.5Na0.5TiO3 solution by a certain molar ratio and then regulating the pH value to 7-7.5 with ammonia water; aging, dewatering and drying the mixed solution to form black xerogel; grinding the xerogel and carrying out heat treatment to remove organic matters to obtain precursor powder; and grinding, tabletting and sintering the precursor powder to obtain the BiFeO3-Bi0.5Na0.5TiO3 base multiferric solid solution ceramic. The BiFeO3-Bi0.5Na0.5TiO3 base multiferric solid solution ceramic has the characteristics of single phase structure, low leakage current, ferroelectric / ferromagnetic coexistence at room temperature, and the like and has wide application prospect in the aspects of manufacturing emerging spin valve devices, magnetoelectric storages, magnetoelectric sensors and microwave resonance devices.

Description

technical field [0001] The invention belongs to the technical field of information functional materials, in particular to a BiFeO with room temperature multiferroicity 3 -Bi 0.5 Na 0.5 TiO 3 Preparation method of base solid solution ceramics. Background technique [0002] A multiferroic material refers to a material that exhibits both ferroelectric (antiferroelectric) and ferromagnetic (antiferromagnetic) or ferroelastic ordering properties. In this material, electric polarization and magnetization can be coupled to each other to produce new functions, such as the magnetoelectric coupling effect, that is, the property that the material produces ferroelectric polarization under an external magnetic field, or produces magnetic polarization under an external electric field. This effect shows extremely broad application prospects in emerging spin valve devices, magnetoelectric memories, magnetoelectric sensors and microwave resonance devices, and has become a new research ho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C04B35/26C04B35/624
Inventor 田召明袁松柳伍茂松马峥峥
Owner HUAZHONG UNIV OF SCI & TECH
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