High-energy-storage sodium bismuth titanate-strontium titanate matrix material and preparation method thereof

A technology of sodium bismuth titanate and dielectric materials, which is applied in the field of ceramic materials, can solve the problems of lowering the sintering temperature and increasing the density of the system, and achieves the effect of low cost and good energy storage characteristics

Inactive Publication Date: 2019-04-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, some scholars have found that after MgO doping BNT, it will reduce its sintering temperature and increase the density of the system.

Method used

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  • High-energy-storage sodium bismuth titanate-strontium titanate matrix material and preparation method thereof
  • High-energy-storage sodium bismuth titanate-strontium titanate matrix material and preparation method thereof
  • High-energy-storage sodium bismuth titanate-strontium titanate matrix material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high energy storage sodium bismuth titanate-strontium titanate based dielectric material, the chemical composition expression of which is 0.5Bi 0.5 Na 0.5 TiO 3 -0.5SrTiO 3 -0.5wt%MgO, its preparation method specifically comprises the following steps:

[0031] (1) According to the composition expression, weigh 0.5mol SrCO 3 , 0.5mol TiO 2 As the preparation of SrTiO 3 Raw material A; Weigh 0.5mol TiO 2 , 0.125mol Bi 2 o 3 and 0.125mol Na 2 CO 3 As the preparation of Bi 0.5 Na 0.5 TiO 3 raw material B;

[0032] (2) Put the weighed raw material A into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill it on a horizontal mill for 24 hours; then dry it at 100°C for 24 hours and then pre-calcine it. The temperature is 1150°C, and the pre-firing process is to raise the temperature from room temperature to the required pre-firing temperature at a rate of 2°C / min, keep it warm for 2 hours, and then cool naturally with the furnace to...

Embodiment 2

[0042] A high energy storage sodium bismuth titanate-strontium titanate based dielectric material, the chemical composition expression of which is 0.5Bi 0.5 Na 0.5 TiO 3 -0.5SrTiO 3 -1.0wt%MgO, its preparation method specifically comprises the following steps:

[0043] (1) According to the composition expression, weigh 0.5mol SrCO 3 , 0.5mol TiO 2 As the preparation of SrTiO 3 Raw material A; Weigh 0.5mol TiO 2 , 0.125mol Bi 2 o 3 and 0.125mol Na 2 CO 3 As the preparation of Bi 0.5 Na 0.5 TiO 3 raw material B;

[0044] (2) Put the weighed raw material A into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill it on a horizontal mill for 24 hours; then dry it at 100°C for 24 hours and then pre-calcine it. The temperature is 1150°C, and the pre-firing process is to raise the temperature from room temperature to the required pre-firing temperature at a rate of 2°C / min, and keep it warm for 2 hours, and then cool naturally with the furnac...

Embodiment 3

[0054] A high energy storage sodium bismuth titanate-strontium titanate based dielectric material, the chemical composition expression of which is 0.5Bi 0.5 Na 0.5 TiO 3 -0.5SrTiO 3 -1.5wt%MgO, its preparation method specifically comprises the following steps:

[0055] (1) According to the composition expression, weigh 0.5mol SrCO 3 , 0.5mol TiO 2 As the preparation of SrTiO 3 Raw material A; Weigh 0.5mol TiO 2 , 0.125mol Bi 2 o 3 and 0.125mol Na 2 CO 3 As the preparation of Bi 0.5 Na 0.5 TiO 3 raw material B;

[0056] (2) Put the weighed raw material A into a ball mill jar, use zirconia balls and absolute ethanol as the medium, and mill it on a horizontal mill for 24 hours; then dry it at 100°C for 24 hours and then pre-calcine it. The temperature is 1150°C, and the pre-firing process is to raise the temperature from room temperature to the required pre-firing temperature at a rate of 2°C / min, and keep it warm for 2 hours, and then cool naturally with the furnac...

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Abstract

The invention discloses a high-energy-storage sodium bismuth titanate-strontium titanate matrix material. The chemical formula of the high-energy-storage sodium bismuth titanate-strontium titanate matrix material is 0.5Bi0.5Na0.5TiO3-0.5SrTiO3-x wt%MgO, wherein x=0.5-3.0. A preparation method of the high-energy-storage sodium bismuth titanate-strontium titanate matrix material comprises the following steps of preparing SrCO3, TiO2, Bi2O3, Na2CO3 and MgO by weight ratio according to the chemical formula into a ceramic powder, performing ball milling, drying and pelletizing, and then pressing the ceramic powder in a tablet press into a ceramic blank; rubber-discharging and sintering the ceramic blank inside a muffle furnace to obtain a ceramic sample. The preparation method of the high-energy-storage sodium bismuth titanate-strontium titanate matrix material is simple in preparation process, low in cost and free from pollution; the prepared high-energy-storage sodium bismuth titanate-strontium titanate matrix material achieves a high discharging energy storage density of 1.61-2.17 J/cm3 and a high breakdown strength of 137-226 KV/cm.

Description

technical field [0001] The invention relates to the technical field of ceramic materials applied to electronic components, in particular to a high-energy-storage sodium bismuth titanate-strontium titanate-based dielectric material and a preparation method thereof. Background technique [0002] The high power and miniaturization of the pulse power system requires the research of energy storage dielectrics with excellent performance as components, which requires materials with high dielectric constant, low dielectric loss and high breakdown field strength, so that the storage of the device High energy density and high energy storage efficiency. For BNT-based relaxor ferroelectrics, the dielectric relaxation behavior is caused by the thermal evolution of PNRs, so that BNT has a high polarization ability, and the remanent polarization and coercive field strength of BNT are relatively high. Large, can basically meet the requirements of energy storage dielectric ceramics. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/47C04B35/622C04B35/626
CPCC04B35/47C04B35/475C04B35/622C04B35/62675C04B2235/96C04B2235/6562C04B2235/6567C04B2235/3232C04B2235/3206C04B2235/3201
Inventor 刘韩星黄宁郝华谢鹃曹明贺尧中华
Owner WUHAN UNIV OF TECH
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