Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics with quasi-isomorphic phase boundary

A technique of quasi-isotype phase boundary and potassium bismuth titanate is applied in the field of preparation of potassium bismuth titanate-based lead-free relaxor ferroelectric ceramics to achieve the effect of good temperature stability

Active Publication Date: 2020-08-18
TONGJI UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics with quasi-isomorphic phase boundary
  • Preparation method of bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics with quasi-isomorphic phase boundary
  • Preparation method of bismuth potassium titanate-based lead-free relaxor ferroelectric ceramics with quasi-isomorphic phase boundary

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com