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High-temperature piezoelectric and dielectric energy storage lead-free ceramic and preparation method thereof

A high-temperature piezoelectric and high energy storage density technology, which is applied in the field of piezoelectric and dielectric energy storage ceramic materials, can solve the problems of low energy storage density and short discharge life, and achieve the effect of fine and uniform grains and high density

Inactive Publication Date: 2015-06-03
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, dielectric capacitors have problems such as low energy storage density and short discharge life, which make it difficult to meet the needs of further development of new technologies
[0004] So far, there have been no reports on lead-free ceramic materials with high temperature piezoelectric properties and high energy storage density and their preparation methods

Method used

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  • High-temperature piezoelectric and dielectric energy storage lead-free ceramic and preparation method thereof
  • High-temperature piezoelectric and dielectric energy storage lead-free ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation ingredients are: (1- x - y )BiFeO 3 – x BaTiO 3 – y NaNbO 3 +0.005(0.5MnO 2 -0.3CuO-0.2CeO 2 ),in x =0.25, y =0.12 for ceramic materials.

[0028] The preparation method comprises the following steps:

[0029] (1) To analyze pure powder Na 2 CO 3 and Nb 2 o 5 As a raw material, according to the chemical formula NaNbO3 for batching, according to the chemical formula NaNbO 3 For batching, use absolute ethanol as the medium for ball milling and wet grinding for 12 hours, dry at 80 °C, and then pre-synthesize NaNbO in an alumina crucible at 850 °C for 2 hours 3 powder.

[0030] (2) To analyze pure powder: Bi 2 o 3 、BaCO 3 , Fe 2 o 3 and TiO 2 Be raw material, according to chemical formula according to chemical formula (1- x - y )BiFeO 3 – x BaTiO3 ,in x , y represents the mole fraction, x =0.25, y =0.12, carry out batching, use absolute ethanol as medium ball mill for 12 hours, after drying, pre-burn at 800°C for 2 hours to syn...

Embodiment 2

[0038] The preparation ingredients are: (1- x - y )BiFeO 3 – x BaTiO 3 – y K 0.5 Na 0.5 NbO 3 +0.005(0.5MnO 2 - 0.3CuO- 0.2CeO 2 ),in x =0.28, y =0.10 for ceramic materials.

[0039] The preparation method is the same as in Example 1, except that the first step sintering temperature is 980°C, and the second step sintering temperature is 900°C.

[0040] The performance is shown in Table 1.

Embodiment 3

[0042] The preparation ingredients are: (1- x - y )BiFeO 3 – x BaTiO 3 – y K 0.5 Na 0.5 TaO 3 +0.005(0.5MnO 2 - 0.3CuO- 0.2CeO 2 ),in x =0.32, y =0.16 for ceramic materials.

[0043] The preparation method is the same as in Example 1, except that the first step sintering temperature is 1000°C, and the second step sintering temperature is 900°C.

[0044] The performance is shown in Table 1.

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Abstract

The invention discloses a lead-free ceramic dielectric material with high temperature piezoelectric performance and high energy storage density. The composition is represented as formulas as follows: (1-x-y)BiFeO3-xBaTiO3-yMeNbO3 +0.005(0.5MnO2-0.3CuO-0.2CeO2) or (1-x-y)BiFeO3-xBaTiO3-yMeTaO3 +0.005 (0.5MnO2-0.3CuO-0.2CeO2) or (1-x-y)BiFeO3-xBaTiO3-yMeSbO3 +0.005 (0.5MnO2-0.3CuO- 0.2CeO2), wherein Me is one or two of alkali metal elements Li, Na and K; x and y represent mole fraction, x is larger than or equal to 0.1 and smaller than or equal to 0.5, y is larger than or equal to 0.05 and smaller than or equal to 0.3. The uniform and compact ceramic with controllable constituent structure gradient is obtained in combination of step-by-step synthesis and two-step sintering. The ceramic with high temperature piezoelectric performance and high energy storage density has excellent energy storage density, high piezoelectric constant and high Curie temperature, the energy storage density can be up to 1.1 J / cm <3>, the piezoelectric constant d33 can be up to 282 pm / V, the strain can be up to 0.22%, the Curie temperature can be up to 501 DEG C, and the ceramic is green, environment-friendly and good in practicability.

Description

technical field [0001] The invention relates to a piezoelectric and dielectric energy storage ceramic material, in particular to a high-temperature, high-performance piezoelectric and dielectric energy storage lead-free ceramic material and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are important functional materials for the mutual conversion of mechanical energy and electrical energy, and are often used as actuator materials in micromechanical design. Piezoelectric ceramic drivers have attracted much attention due to their advantages of high response frequency, fast response, large driving force, good linearity, low energy consumption and low price. At present, piezoelectric / electrostrictive actuators have been successfully applied in many technical fields such as precision positioning, precision machining, intelligent structure, bioengineering, aerospace, electronic communication, automobile industry, robot joints, and medical equipm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/468C04B35/622C04B35/64H10N30/853
Inventor 周昌荣黎清宁许积文袁昌来曾卫东陈国华
Owner GUILIN UNIV OF ELECTRONIC TECH
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