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摘要:
A 0-3 type 0.8Na(0.5)Bi(0.5)TiO(3)(BNT):0.2ZnO lead-free ferroelectric composite ceramic structure was prepared by a solid-state oxide route. The X-ray diffraction analysis and scanning electron microscopy observation indicate that ZnO grains were scattered in the matrix consisting of BNT grains to form a (0-3) type composite structure, and a third phase Zn2TiO4 was formed due to the reaction ability of nano-sized ZnO with NBT compositions. The temperature-dependent electrical responses show that the dielectric anomaly at around 200 degrees C inherited from NBT itself was suppressed as ZnO is composited, and the P-r of the specimen sintered at 1000 degrees C keeps almost unchanged as the poling temperature is 175 degrees C, while its retained piezoelectric strain d(33) value maintains 77% of the initial as exposed to 125 degrees C annealing. These results suggest that the thermal depolarisation of BNT is suppressed due to the introduction of ZnO, even though the third phase Zn2TiO4 exists.
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来源 :
ADVANCES IN APPLIED CERAMICS
ISSN: 1743-6753
年份: 2018
期: 3
卷: 117
页码: 133-141
2 . 2 0 0
JCR@2022
ESI学科: MATERIALS SCIENCE;
ESI高被引阀值:260