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Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with negative electrocaloric effect and preparation method thereof

A bismuth titanate-based bismuth, lead-free piezoelectric technology, applied in the field of electronic functional materials and devices, can solve problems such as application limitations of lead-containing films

Active Publication Date: 2021-11-23
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the application of lead-containing film has been gradually restricted

Method used

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  • Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with negative electrocaloric effect and preparation method thereof
  • Bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with negative electrocaloric effect and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic Bi with negative charge card effect by solid-state reaction method 4- x Ce x Ti 2.98 (WNb) 0.01 o 12 . Wherein, x=0.03. Weigh Bi according to the stoichiometric ratio 2 o 3 、TiO 2 、WO 3 , Nb 2 o 5 , CeO 2 powder, and use it as a raw material. The raw materials are mixed by wet ball milling method, the mass ratio of raw materials: balls: alcohol = 1:1.5:0.75, and ball milled for 4 hours to mix all components uniformly to obtain a mixture. Dry the mixture and pass it through a 40-mesh sieve. After briquetting at 5MPa, raise the temperature to 850°C at a rate not higher than 2°C / min and keep it warm for 2 hours to obtain a calcined block. Grind and crush the calcined block, pass through a 40-mesh sieve, continue to mix according to the wet ball milling method, the mass ratio of mixture: balls: alcohol = 1:2:0.65, ball mill for 4 hours and then dry to obtain ceramic...

Embodiment 2

[0042] It is basically the same as Embodiment 1, the only difference is that x=0.04.

Embodiment 3

[0044] It is basically the same as Embodiment 1, the only difference is that x=0.05.

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Abstract

The invention discloses a bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic with a negative electrocaloric effect and a preparation method thereof. The chemical composition of the bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic is Bi<4-x>Ce<x>Ti<2.98> (WNb)<0.01>O<12>, wherein x is more than 0 and less than or equal to 0.07. The bismuth titanate-based bismuth layered structure lead-free piezoelectric ceramic has the characteristics of wide working temperature range and large negative electrocaloric effect, does not cause harm to the ecological environment and human health in the preparing, using and discarding processes, and is suitable for development of miniature refrigerators in the future.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, in particular to a lead-free piezoelectric ceramic with a bismuth titanate-based bismuth layer structure and a preparation method thereof. Background technique [0002] Refrigeration technology is indispensable in daily life and industrial production. Traditional refrigeration technology mostly uses Freon as the medium refrigerant, and the entire cycle in this refrigeration process is a vapor compression process. The solid-state refrigeration device based on the reversible adiabatic temperature change based on the electric card effect has the advantages of high efficiency, small size, convenient use, and environmental protection. Accordingly, the electric card effect solid-state refrigeration is expected to replace high-energy-consuming refrigeration technology to greatly improve the efficiency of the refrigeration cycle, and can also reduce damage to the envi...

Claims

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Application Information

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IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3229C04B2235/3258C04B2235/3251C04B2235/6562C04B2235/6567C04B2235/96
Inventor 董显林谢新春周志勇
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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