Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 30    No. 3    March 2020

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Dielectric properties and relaxor ferroelectric behavior of (1-y)Ba(Zr0.1Ti0.9)O3-yBa(Zn1/3Nb2/3)O3 ceramics
Xin ZHONG, Chen ZHANG, Fang-xu CHEN, Zhu-ming TANG, Gang JIAN

Department of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China

Abstract:The microstructure, dielectric and ferroelectric properties of (1-y)Ba(Zr0.1Ti0.9)O3-yBa(Zn1/3Nb2/3)O3 (y=0-0.05) ceramics prepared by traditional solid state method were investigated by X-ray diffractometer, scanning electron microscope, electric parameter testing system and ferroelectric tester. It is found that the barium zirconate titanate based ceramics are single-phase perovskites as y increases up to 0.05 and their average grain size decreases with the increase of y. The permittivity maximum εr,max is suppressed from 8948 to 1611 at 1 kHz with increasing y, and the ferroelectric-paraelectric phase transition temperature Tm decreases from 93 to -89 °C at 1 kHz as y increases. The composition-induced diffuse phase transition is enhanced with increasing y. The relaxor-like ferroelectric behavior with a strong frequency dispersion of Tm and permittivity at T<Tm accompanied by a strong diffuse phase transition is found for the system with high y value. The remnant polarization decreases with increasing y, while the coercive field decreases remarkably and then increases with the increase of y.

 

Key words: barium zirconate titanate; dielectric properties; relaxor ferroelectric behavior; perovskite; phase transition

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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