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Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof
The invention discloses a sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and a preparation method thereof. The general formula of the material is (1-x)(Na0.5Bi0.5)TiO3-xSrTiO3-0.01KNbO3-ySm2O3-zY2O3, wherein x=0.45-0.60, y=0.01-0.02, and z=0.01-0.04. The preparation technique adopts a solid-phase process and comprises the following steps: respectively presintering and synthesizing (Na0.5Bi0.5)TiO3, SrTiO3 and KNbO3 powders, carrying out ball milling in an ethanol medium according to the stoichiometric proportion by using rare-earth Sm2O3 and Y2O3 as dopants to obtain a slurry, drying, grinding, carrying out extrusion forming, and sintering to obtain the ceramic. The ceramic material prepared by the method has favorable dispersivity when the dielectric peak is 20-50 DEG C, and the dispersion coefficient gamma is greater than 1.9. The ceramic material has favorable electrostrictive properties, and the maximum electrostriction value in a 40kv/cm electric field is 0.3%. The dielectric constant at room temperature under the condition of 1kHz is greater than 3500, and the dielectric loss is lower than 0.02. The material has the advantages of simple preparation technique and low price, is free of the harmful element Pb, satisfies the requirements for the environment-friendly material, and has favorable application prospects in the fields of ultrasonic transducers, micro shifters and the like.
Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof
The invention discloses a sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and a preparation method thereof. The general formula of the material is (1-x)(Na0.5Bi0.5)TiO3-xSrTiO3-0.01KNbO3-ySm2O3-zY2O3, wherein x=0.45-0.60, y=0.01-0.02, and z=0.01-0.04. The preparation technique adopts a solid-phase process and comprises the following steps: respectively presintering and synthesizing (Na0.5Bi0.5)TiO3, SrTiO3 and KNbO3 powders, carrying out ball milling in an ethanol medium according to the stoichiometric proportion by using rare-earth Sm2O3 and Y2O3 as dopants to obtain a slurry, drying, grinding, carrying out extrusion forming, and sintering to obtain the ceramic. The ceramic material prepared by the method has favorable dispersivity when the dielectric peak is 20-50 DEG C, and the dispersion coefficient gamma is greater than 1.9. The ceramic material has favorable electrostrictive properties, and the maximum electrostriction value in a 40kv/cm electric field is 0.3%. The dielectric constant at room temperature under the condition of 1kHz is greater than 3500, and the dielectric loss is lower than 0.02. The material has the advantages of simple preparation technique and low price, is free of the harmful element Pb, satisfies the requirements for the environment-friendly material, and has favorable application prospects in the fields of ultrasonic transducers, micro shifters and the like.
Sodium-bismuth-titanate-base lead-free electrostrictive ceramic material and preparation method thereof
CAO WANQIANG (Autor:in) / ZHOU CHAO (Autor:in) / LIU PEICHAO (Autor:in) / ZHOU FENGLI (Autor:in) / LI YANG (Autor:in) / WANG LONGHAI (Autor:in) / QI YAJUN (Autor:in)
11.11.2015
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
| Europäisches Patentamt | 2023
| Europäisches Patentamt | 2023
| Europäisches Patentamt | 2023
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| Europäisches Patentamt | 2021