Strain effects of temperature and electric field induced phase instability in (Na,K)(Nb,Sb)O3-LiTaO3 lead-free ceramics
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- 作者：Ruzhong Zuo ; piezolab@hfut.edu.cn ; rzzuo@hotmail.com ; He Qi ; Jian Fu
- 关键词：Field induced strains ; Synchrotron x-ray diffraction ; Phase transition ; Lead-free piezoelectrics
- 刊名：Journal of the European Ceramic Society
- 出版年：2017
- 出版时间：May 2017
- 年：2017
- 卷：37
- 期：5
- 页码：2309-2313
- 全文大小：1294 K
- 卷排序：37
文摘
The temperature and electric field induced phase instability were found to produce distinctly different temperature-dependences of small- and high-field strains in the proximity of orthorhombic (O) to tetragonal (T) polymorphic phase transition of (Na,K)(Nb,Sb)O3-LiTaO3 lead-free ceramics. As evidenced by means of in-situ and ex-situ synchrotron x-ray diffraction and quantitative analyses, both O-T phase coexistence and intermediate monoclinic (Mc) phase were believed to promote intrinsic piezoelectric strains. Further increase of high-field strains with temperature was ascribed to enhanced contributions from field-induced reversible Mc-T phase transition, plus little extrinsic contribution from non-180° domain switching which was unexpectedly hindered near the phase boundary.