Method for preparing strontium barium niobate ceramics with high pyroelectric effects

A technology of barium strontium niobate and electrocaloric effect, which is applied in the field of high electrocaloric effect ceramic materials and its preparation, can solve the problems of affecting the ferroelectric properties of ceramics, affecting the ferroelectric effect, etc. Uniform, small grain size effect

Active Publication Date: 2016-07-13
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polarization value of ceramics at different temperatures has been studied, and it is found that different sintering methods will affect the ferroelectric properties of ceramics, thereby affecting the ferroelectric effect

Method used

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  • Method for preparing strontium barium niobate ceramics with high pyroelectric effects
  • Method for preparing strontium barium niobate ceramics with high pyroelectric effects
  • Method for preparing strontium barium niobate ceramics with high pyroelectric effects

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) BaCO 3 , SrCO 3 and Nb 2 o 5 The raw material powder is respectively according to Sr 0.4 Ba 0.6 Nb 2 o 6 Chemical formula weighing ingredients;

[0027] (2) Put the chemical raw material prepared in step (1) into a ball milling jar, and add ZrO in the plastic ball milling jar 2 Zirconium balls are added with absolute ethanol, and placed on a ball mill for ball milling for 24 hours (with a particle size of 100nm to 400nm). The milled powder is dried in an oven and sieved through a 120-mesh sieve. The prepared powder was calcined at 1200°C for 3 hours, cooled to 1100°C at 2°C / min, then cooled to room temperature with the furnace, and passed through a 120-mesh sieve to obtain Sr 0.4 Ba 0.6 Nb 2 o 6 Powder;

[0028] (3) Put the powder prepared in step (2) into a graphite mold with a diameter of 10mm, put it into a spark plasma sintering system and sinter at 1000°C and 30MPa mechanical pressure, keep it warm for 5 minutes, and the heating rate from room tempe...

Embodiment 2

[0032] (1) BaCO 3 , SrCO 3 and Nb 2 o 5 The raw material powder is respectively according to Sr 0.5 Ba 0.5 Nb 2 o 6 Chemical formula weighing ingredients;

[0033] (2) Put the chemical raw material prepared in step (1) into a ball milling jar, and add ZrO in the plastic ball milling jar 2 Zirconium balls are added with absolute ethanol, and placed on a ball mill for ball milling for 24 hours (with a particle size of 100nm to 400nm). The milled powder is dried in an oven and sieved through a 120-mesh sieve. The prepared powder was calcined at 1200°C for 3 hours, cooled to 1100°C at 2°C / min, then cooled to room temperature with the furnace, and passed through a 120-mesh sieve to obtain Sr 0.5 Ba 0.5 Nb 2 o 6 Powder;

[0034] (3) Put the powder prepared in step (2) into a graphite mold with a diameter of 10mm, put it into a spark plasma sintering system and sinter it under 1025°C and 30MPa mechanical pressure, keep it warm for 5 minutes, and the heating rate from room...

Embodiment 3

[0037] (1) BaCO 3 , SrCO 3 and Nb 2 o 5 The raw material powder is respectively according to Sr 0.6 Ba 0.4 Nb 2 o 6 Chemical formula weighing ingredients;

[0038] (2) Put the chemical raw material prepared in step (1) into a ball milling jar, and add ZrO in the plastic ball milling jar 2 Zirconium balls are added with absolute ethanol, and placed on a ball mill for ball milling for 24 hours (with a particle size of 100nm to 400nm). The milled powder is dried in an oven and sieved through a 120-mesh sieve. The prepared powder was calcined at 1300°C for 3 hours, cooled to 1100°C at 2°C / min, cooled to room temperature with the furnace, and passed through a 120-mesh sieve to obtain Sr 0.6 Ba 0.4 Nb 2 o 6 Powder;

[0039] (3) Put the powder obtained in step (2) into a graphite mold with a diameter of 10mm, put it into a spark plasma sintering system and sinter it at 1050°C and 30MPa mechanical pressure, keep it warm for 5 minutes, and the heating rate from room tempera...

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Abstract

The invention discloses a method for preparing strontium barium niobate ceramics with high pyroelectric effects.The method includes mixing raw materials BaCO<3>, SrCO<3> and Nb<2>O<5> according to a chemical formula of Sr<x>Ba<1-x>Nb<2>O<6> to obtain Sr<x>Ba<1-x>Nb<2>O<6> powder; sintering the Sr<x>Ba<1-x>Nb<2>O<6> powder by the aid of a spark plasma sintering system in a vacuum environment at the temperature of 1000-1050 DEG C to prepare ceramic sintered bodies and thermally treating the ceramic sintered bodies in the air at the temperature of 965-980 DEG C for 3 hours to obtain the strontium barium niobate ceramics with the high pyroelectric effects.The x can be equal to 0.4 or 0.5 or 0.6.The method has the advantages that the strontium barium niobate ceramics with the high pyroelectric effects have small crystal grain sizes and are high in density, the dielectric breakdown field strength is improved, accordingly, the strontium barium niobate ceramics hopefully can be used for solid-state refrigerating systems, and various currently confronted climatic environmental problems due to the fact that ozone layers are destructed by Freon which is used as a refrigerants can be solved.

Description

technical field [0001] The invention relates to a high electric card effect ceramic material of a solid-state electric card refrigeration and energy collection device and a preparation method thereof. Background technique [0002] The Electrocaloric Effect (hereinafter referred to as ECE) refers to the phenomenon that the material can produce reversible temperature changes when an electric field is applied and removed to the material under adiabatic conditions, which can effectively realize the efficiency of solid-state refrigeration components. It can realize no greenhouse gas emission, and provides an effective way to solve the problem of environmental damage caused by Freon as a refrigerant. At present, there are four main types of materials with strong electric card effect: 1. Lead-based composite perovskite; 2. SrBi 2 Ta 2 o 9 thin film; three, BaTiO 3 , SrTiO 3 、Ba (1-x) Sr x TiO 3 Class; Four, (1,1-difluoroethylene-trifluoroethylene)-based films. The electroc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/64
CPCC04B35/495C04B35/64C04B2235/3213C04B2235/3215C04B2235/5445C04B2235/6562C04B2235/666
Inventor 吴淑雅张志聪陈湘明
Owner ZHEJIANG UNIV
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