Morphotropic phase boundary potassium-bismuth titanate-based leadless relaxor ferroelectric ceramic preparation method

A quasi-isomorphic phase boundary, bismuth potassium titanate technology, applied in the field of preparation of bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics, to achieve good temperature stability

Active Publication Date: 2018-03-27
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrocardiographic effect of bismuth potassium titanate system has not been studied

Method used

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  • Morphotropic phase boundary potassium-bismuth titanate-based leadless relaxor ferroelectric ceramic preparation method
  • Morphotropic phase boundary potassium-bismuth titanate-based leadless relaxor ferroelectric ceramic preparation method
  • Morphotropic phase boundary potassium-bismuth titanate-based leadless relaxor ferroelectric ceramic preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , K 2 CO 3 ,TiO 2 , La 2 o 3 ,TiO 2 , 4 (MgCO 3 )·Mg(OH) 2 ·5H 2 O as a raw material for bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics. According to the chemical formula 0.99Bi 0.5 K 0.5 TiO 3 -0.01La(Mg 0.5 Ti 0.5 )O 3 Weighing, adding absolute ethanol to the nylon tank for ball milling, discharging, and drying. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, tamp it, cover the crucible, put it into a muffle furnace for calcination, raise it to 920 ℃ at 5°C / min, keep it warm for 2 hours, and calcine twice.

[0031] (2) Secondary ball milling of the synthesized powder obtained in step (1), discharging and drying. The drying temperature is the same as in step (1), and the ball milling time is 12 hours. Add an appropriate amount of 5wt% PVA to the dried powder for granulation, and press...

Embodiment 2

[0037] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , K 2 CO 3 ,TiO 2 , La 2 o 3 ,TiO 2 , 4 (MgCO 3 )·Mg(OH) 2 ·5H 2 O as a raw material for bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics. According to the chemical formula 0.99Bi 0.5 K 0.5 TiO 3 -0.01La(Mg 0.5 Ti 0.5 )O 3 Weighing, adding absolute ethanol to the nylon tank for ball milling, discharging, and drying. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, tamp it, cover the crucible, put it into a muffle furnace for calcination, raise it to 920 ℃ at 5°C / min, keep it warm for 2 hours, and calcine twice.

[0038] (2) Secondary ball milling of the synthesized powder obtained in step (1), discharging and drying. The drying temperature is the same as in step (1), and the ball milling time is 12 hours. Add an appropriate amount of 5wt% PVA to the dried powder for granulation, and press...

Embodiment 3

[0044] (1) select the raw material Bi whose purity is greater than 99% 2 o 3 , K 2 CO 3 ,TiO 2 , La 2 o 3 ,TiO 2 , 4 (MgCO 3 )·Mg(OH) 2 ·5H 2 O as a raw material for bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics. According to the chemical formula 0.99Bi 0.5 K 0.5 TiO 3 -0.01La(Mg 0.5 Ti 0.5 )O 3 Weighing, adding absolute ethanol to the nylon tank for ball milling, discharging, and drying. The ball milling time was 8 hours, and the drying temperature was 120°C. Put the dried powder into a corundum crucible, tamp it, cover the crucible, put it into a muffle furnace for calcination, raise it to 920 ℃ at 5°C / min, keep it warm for 2 hours, and calcine twice.

[0045] (2) Secondary ball milling of the synthesized powder obtained in step (1), discharging and drying. The drying temperature is the same as in step (1), and the ball milling time is 12 hours. Add an appropriate amount of 5wt% PVA to the dried powder for granulation, and press...

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Abstract

The invention relates to a morphotropic phase boundary potassium-bismuth titanate-based leadless relaxor ferroelectric ceramic preparation method. The method comprises the following steps: selecting raw materials and performing two-time ball milling, discharging materials, drying the materials, and calcining the materials to obtain ceramic powder, dumping the material in a muffle furnace and performing sintering, and using sand paper with different granularity for grinding sintered ceramic chip to obtain the thin ceramic chip with a flat and bright surface. Compared with the prior art, the ceramic phase structure constitutes rhombohedral phase and tetragonal phase, under effect of an electrical field, a ferroelectric domain is easily overturned, large electrocaloric effect can be obtained,the ceramic can be obtained through a common sintering method, cost is low, and pollution is not generated, the prepared material has electrocaloric effect in a wide temperature area, and has a largeapplication prospect on a solid refrigeration aspect.

Description

technical field [0001] The invention belongs to the technical field of electronic functional materials and devices, in particular to a method for preparing bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics with quasi-isotype phase boundaries. Background technique [0002] At present, the refrigerating substances used in most refrigeration devices are mainly chlorofluorocarbons, because chlorofluorocarbons will consume the ozone layer in the atmosphere and increase the greenhouse effect, causing certain damage to the environment, which is not conducive to the construction of ecological civilization. As human society pays more and more attention to the environment, it is necessary to develop new environmentally friendly technologies to replace Freon. Especially after A.S.Mischenko and B.Neese et al. found a huge electric card effect in antiferroelectric thin films and polymers [A.S.Mischenko et.al., Science 311(2006) 1270] [B.Neese, Science 321( 2008) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3201C04B2235/3206C04B2235/3227C04B2235/3234
Inventor 翟继卫李峰刘星李朋沈波
Owner TONGJI UNIV
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