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High-energy-storage and high-efficiency bismuth ferrite-strontium titanate ceramic and preparation method thereof

A high-efficiency, bismuth ferrite technology, applied in the field of relaxor ferroelectrics, can solve the problems of the second phase and sintering non-densification, and achieve the effect of reducing the steps of removing the binder, reducing defects, and avoiding waste

Pending Publication Date: 2022-04-08
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a method for preparing bismuth ferrite-strontium titanate ceramics with high energy storage and high efficiency, which effectively suppresses the volatilization of Bi and solves the problem of bismuth ferrite-based ceramics. It is prone to the problems of the second phase and the sintering is not dense, which can guarantee better energy storage performance in theory

Method used

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  • High-energy-storage and high-efficiency bismuth ferrite-strontium titanate ceramic and preparation method thereof
  • High-energy-storage and high-efficiency bismuth ferrite-strontium titanate ceramic and preparation method thereof
  • High-energy-storage and high-efficiency bismuth ferrite-strontium titanate ceramic and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] The chemical formula of the ceramic material is: 0.6BiFeO 3 -0.4SrTiO 3 -xwt%MnO 2 , where x represents the mass ratio, and x=0.

[0030] Above 0.6BiFeO 3 -0.4SrTiO 3 -0wt%MnO 2 A method for preparing a ceramic material, comprising the steps of:

[0031] (1) According to the chemical formula 0.6BiFeO 3 -0.4SrTiO 3 -0wt%MnO 2 Analytical pure Bi 2 o 3 , Fe 2 o 3 , SrCO 3 、TiO 2 and MnO 2 After preparation, among them, Bi 2 o 3 , Fe 2 o 3 , SrCO 3 with TiO 2 The molar ratio is: 1:1:1:1, MnO 2 The addition amount of is 0wt%. The mass ratio of raw materials, deionized water, and ball stones is 1:1:5, and the ball mill is mixed evenly for 12 hours, then dried at 80°C for 24 hours, and 0.6BiFeO with uniform size is obtained after passing through a 120-mesh sieve. 3 -0.4SrTiO 3 -0wt%MnO 2 Powder;

[0032] (2) 0.6BiFeO will be obtained 3 -0.4SrTiO 3 -0wt%MnO 2 The powder is poured into a mold with a diameter of 12mm and pressed into a mold, and the f...

Embodiment 2

[0037] The chemical formula of the ceramic material is: 0.6BiFeO 3 -0.4SrTiO 3 -xwt%MnO 2 , where x represents the mass ratio, and x=0.1.

[0038] Above 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 A method for preparing a ceramic material, comprising the steps of:

[0039] (1) According to the chemical formula 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 Analytical pure Bi 2 o 3 , Fe 2 o 3 , SrCO 3 、TiO 2 and MnO 2 After preparation, among them, Bi 2 o 3 , Fe 2 o 3 , SrCO 3 with TiO 2 The molar ratio is: 1:1:1:1, MnO 2 The added amount is 0.1wt%, and the mass ratio of raw materials, deionized water, and ball stones is 1:1:5, and the ball mill is mixed evenly for 12 hours, then dried at 80°C for 24 hours, and passed through a 120-mesh sieve to obtain a uniform size. 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 Powder;

[0040] (2) 0.6BiFeO will be obtained 3 -0.4SrTiO 3 -0.1wt%MnO 2 The powder is poured into a mold with a diameter of 12mm and pressed into a mold, and the for...

Embodiment 3

[0045] The chemical formula of the ceramic material is: 0.6BiFeO 3 -0.4SrTiO 3 -xwt%MnO 2 , where x represents the mass ratio, and x=0.1, and it has been buried and sintered during the sintering process.

[0046] Above 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 A method for preparing a ceramic material, comprising the steps of:

[0047] (1) According to the chemical formula 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 Analytical pure Bi 2 o 3 , Fe 2 o 3 , SrCO 3 、TiO 2 and MnO 2 After preparation, among them, Bi 2 o 3 , Fe 2 o 3 , SrCO 3 with TiO 2 The molar ratio is: 1:1:1:1, MnO 2 The added amount is 0.1wt%, and the mass ratio of raw materials, deionized water, and ball stones is 1:1:5, and the ball mill is mixed evenly for 12 hours, then dried at 80°C for 24 hours, and passed through a 120-mesh sieve to obtain a uniform size. 0.6BiFeO 3 -0.4SrTiO 3 -0.1wt%MnO 2 Powder;

[0048] (2) 0.6BiFeO will be obtained 3 -0.4SrTiO 3 -0.1wt%MnO 2 The powder is poured into a...

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Abstract

The invention provides high-energy-storage and high-efficiency bismuth ferrite-strontium titanate ceramic and a preparation method thereof. The preparation method comprises the following steps: adding MnO2 into 0.6 BiFeO3-0. 4SrTiO3, carrying out ball milling, drying, briquetting, sieving, carrying out cold isostatic pressing, and carrying out buried sintering treatment to obtain a 0.6 BiFeO3-0. 4SrTiO3-xwt% MnO2 ceramic sample. According to the 0.6 BiFeO3-0. 4SrTiO3-xwt% MnO2 lead-free antiferroelectric ceramic material provided by the invention, the volatilization of Bi is effectively inhibited, the problems that bismuth ferrite-based ceramic is easy to generate a second phase and is not compact in sintering are solved, relatively good energy storage performance can be ensured theoretically, the preparation process is simple, the repeatability is relatively good, the material is green and environment-friendly, and the preparation method is suitable for industrial production. The invention provides a novel lead-free energy storage material matrix.

Description

technical field [0001] The invention relates to the technical field of relaxor ferroelectrics, in particular to a 0.6BiFeO 3 -0.4SrTiO 3 -xwt%MnO 2 Preparation methods and applications of ceramic materials. Background technique [0002] Due to the wide application of pulse discharge devices in military and civilian fields, energy storage capacitors with fast discharge performance and high power density have attracted extensive attention from researchers. To realize the miniaturization of electronic devices, improving energy storage performance is crucial. Among the main electrical energy storage devices, dielectric capacitors have attractive performance characteristics such as high power density, short charge-discharge time, and good durability, and have shown great advantages in the fields of weapons and power electronics. High energy storage density dielectric materials are one of the important research directions in the field of contemporary materials, and have very i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/12H01G4/008
Inventor 蒲永平张金波张贤宁亚婷上阳超张磊
Owner SHAANXI UNIV OF SCI & TECH
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