文献类型：期刊文献

英文题名：Structure and electrical properties of [(Na0.825K0.175)0.5Bi0.5]1+xTiO3 piezoceramics with A-site nonstoichiometry

作者：Chen, Xiaoming Liao, Yunwen Li, Guorong

第一作者：陈小明

通信作者：Chen, Xiaoming

机构：[1] Key Laboratory of Light Metal Materials Processing Technology of Guizhou Province, Guizhou Institute of Technology, Guiyang, China; [2] School of Materials and Energy, Guizhou Institute of Technology, Guiyang, China; [3] College of Chemistry and Chemical Engineering, China West Normal University, Nanchong, China; [4] Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai, China

第一机构：贵州理工学院材料与冶金工程学院

年份：2020

卷号：8

期号：4

起止页码：1036-1042

外文期刊名：Journal of Asian Ceramic Societies

收录：EI(收录号：20203409084952);Scopus(收录号：2-s2.0-85089560302)

语种：英文

外文关键词：Bismuth metallography - Grain growth - Piezoelectric ceramics - Sintering - Sodium compounds - Sodium metallography

摘要：A type of nonstoichiometric piezoceramics, [(Na0.825K0.175)0.5Bi0.5]1+x TiO3 (BKNT-x, x =?0–0.009), was synthesized by the conventional sintering method. The effects of Bi3+, Na+ and K+ content on the structure and electrical properties of 0.825Bi0.5Na0.5TiO3-0.175Bi0.5K0.5TiO3 piezoceramics were investigated.The XRD patterns demonstrated that BKNT-x piezoceramics form a solid solution without a secondary phase. Meanwhile, SEM micrographs indicated that excess [(Na0.825K0.175)0.5Bi0.5]2+ suppresses grain growth and that BKNT-x ceramics become considerably denser. BKNT-0.002 ceramics offer the following enhanced properties: d 33?=?154 pC/N, k p?=?33%, Ε r?=?1087, tanδ?=?0.036, and Q m?=?116. This improvement of properties is most likely related to the dense structure and the maintenance of morphotropic phase boundaries through the introduction of a proper A-site cation excess. For ceramics containing volatile elements, stoichiometric control is an efficacious method of enhancing performance. ? 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of The Korean Ceramic Society and The Ceramic Society of Japan.