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Anti-ferroelectric ceramic material with huge negative electrocaloric effect, preparation method and application thereof

A ceramic material and antiferroelectric technology, applied in the field of antiferroelectric ceramic materials, can solve the problems of high cost and low efficiency, and achieve the effect of large cooling coefficient

Inactive Publication Date: 2017-11-03
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In particular, compared with the magnetic card effect, the advantage of the electric card effect is that it is easier to obtain a large electric field with a large temperature change than a large magnetic field, and the cost is lower; although thermoelectric refrigeration also has the advantages of environmental protection, fast response, and controllability, but Its efficiency is too low and the cost is relatively high; refrigerators made of ferroelectric materials do not need an external compressor, are extremely conducive to miniaturization, and can meet most refrigeration requirements in the new situation, so the development of ferroelectric refrigeration is of positive significance

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  • Anti-ferroelectric ceramic material with huge negative electrocaloric effect, preparation method and application thereof
  • Anti-ferroelectric ceramic material with huge negative electrocaloric effect, preparation method and application thereof
  • Anti-ferroelectric ceramic material with huge negative electrocaloric effect, preparation method and application thereof

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preparation example Construction

[0031] The present invention also provides a method for preparing the above-mentioned antiferroelectric ceramic material, comprising the following steps: S1) mixing lead source, titanium source, zirconium source and lanthanum source for ball milling, and then calcining to obtain the first intermediate; S2) The first intermediate is subjected to secondary ball milling, and after forming, debinding treatment and high-temperature sintering are performed in sequence to obtain an antiferroelectric ceramic material.

[0032] The lead source, the titanium source, the zirconium source and the lanthanum source are mixed for ball milling; wherein, the lead source is a lead source well known to those skilled in the art, and there is no special limitation. The present invention is preferably an oxide of lead, more preferably It is preferably one or more of lead oxide, lead dioxide, and dilead oxide; the titanium source can be a titanium source well known to those skilled in the art, and th...

Embodiment 1

[0044] The chemical composition of ceramic a is: (Pb 0.97 La 0.02 )(Zr 0.95 Ti 0.05 )O 3 (PLZT2 / 95 / 5) Preparation method of ceramics. The preparation of the ceramics adopts a high-temperature solid-state reaction method to prepare PLZT2 / 95 / 5 antiferroelectric ceramics, which specifically includes the following steps:

[0045] 1.1 The oxides with high purity components are used according to the chemical formula of the components (Pb 0.97 La 0.02 )(Zr 0.95 Ti 0.05 )O 3 The stoichiometric requirements are mixed with 99% Pb 3 o 4 ,TiO 2 , ZrO 2 and La 2 o 3 as raw material, while Pb 3 o 4 Excess 5% by weight.

[0046] 1.2 Put the weighed raw materials into a ball mill jar, add 80-100mL of absolute ethanol as a dispersant to ball mill for 24 hours, dry the milled slurry, and then use an alumina crucible to calcinate at 850°C for 5 hours to obtain the first intermediate.

[0047] 1.3 Add 80-100mL of absolute ethanol as a dispersant and mix it with the first interme...

Embodiment 2

[0060] The chemical composition of ceramic b is: (Pb 0.94 La 0.04 )(Zr 0.95 Ti 0.05 )O 3 (PLZT4 / 95 / 5) The preparation method of ceramics The preparation of the ceramics adopts a high-temperature solid-state reaction method to prepare PLZT4 / 95 / 5 antiferroelectric ceramics, which specifically includes the following steps:

[0061] 2.1 Oxides with high purity components are used according to the chemical formula of the components (Pb 0.94 La 0.04 )(Zr 0.95 Ti 0.05 )O 3 The stoichiometric requirements are mixed with 99% Pb 3 o 4 ,TiO 2 , ZrO 2 and La 2 o 3 as raw material, while Pb 3 o 4 Excess 5% by weight.

[0062] 2.2 Put the weighed raw materials into a ball mill jar, add 80-100mL of absolute ethanol as a dispersant to ball mill for 24 hours, dry the milled slurry, and then use an alumina crucible to calcinate at 850°C for 5 hours to obtain the first intermediate.

[0063] 2.3 Add 80-100mL of absolute ethanol as a dispersant and conduct secondary ball milling ...

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Abstract

The invention provides an anti-ferroelectric ceramic material with huge negative electrocaloric effect. The anti-ferroelectric ceramic material comprises the chemical composition shown as (Pb1-3x / 2 Lax) (Zr0.95Ti0.05)O3, wherein x ranges from 0.02-0.1; the anti-ferroelectric ceramic material has huge negative electrocaloric effect. Compared with the prior art, the anti-ferroelectric ceramic material for refrigerating with electrocaloric effect has the characteristic of being large in refrigerating coefficients, high in energy conversion rate, and easy to integrate.

Description

technical field [0001] The invention belongs to the technical field of refrigeration, and in particular relates to an antiferroelectric ceramic material with giant negative electric card effect, its preparation method and application. Background technique [0002] In recent years, environmental and energy issues have become prominent, and the existing refrigeration technology must be greatly improved. Take air conditioners as an example. At present, air conditioners used in large-scale households use freon as a refrigerant, but freon will destroy the ozone layer, and the energy conversion efficiency of air compression technology is low. With the development of economy and technology, people's demand for refrigeration technology is increasing rapidly, and the development of new technologies also requires diversification of refrigeration. Therefore, the importance of high-efficiency, energy-saving, and environmentally friendly refrigeration technology is highlighted. Accordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/491C04B35/622F25B21/00
CPCC04B35/491C04B35/622C04B2235/3227F25B21/00Y02B30/00
Inventor 李彼唐新桂刘秋香蒋艳平
Owner GUANGDONG UNIV OF TECH