A-site Non-stoichiometry Effects on the Dielectric and the Piezoelectric Properties of Pb-free (Na0.50+xLi0.03+yK0.47)(Nb0.8Ta0.2)O3 Ceramics

摘要：

The effects of A-site non-stoichiometry were investigated in (Na0.50+xLi0.03+yK0.47) (Nb0.8Ta0.2) O3 (NLKNT) piezoelectric ceramics prepared by using a solid state reaction method. The content of Na was controlled to be -0.04 < x < +0.04 while the content of Li was controlled to be -0.02 < y < +0.02. A perovskite structure was maintained at all compositions although an impurity phase started forming in the case of x < 0 and y = 0. A polymorphic phase transition temperature between the orthorhombic and the tetragonal phases (To-t) was observed to vary with both Na and Li non-stoichiometry. The highest piezoelectric coefficient ((d33) of 200 pC/N was obtained in the case of x — 0 and y = +0.01, for which To-t was around room temperature.

关键词： Polymorphic phase transition Non-stoichiometry Pb-free ceramics

作者: S. W. Kim T. H. Lee J. H. Lee Y. S. Sung J. H. Cho T. K. Song M. H. Kim M. S. Kim J. S. Song

作者单位: School of Nano & Advanced Materials Engineering,Changwon National University, Changwon 641-773, Kore Battery & Piezoelectric Research Center, Korea Electrotechnology Research Institute, Changwon 641-12

会议类型: 国际会议

会议名称: The 19th Symposium on Dielectric and Advanced Matter Physics & The 11th Workshop on High Dielectric and Ferroelectric Device and Materials(第19届介质及先进凝聚态物理研讨会暨第11届高介电及铁电设备材料研讨会)

会议地点: 首尔

会议语种:英文

页码: 636-639

在线出版日期: 2010-02-07（万方平台首次上网日期，不代表论文的发表时间）