Abstract
(1-x)(K0.475Na0.475Li0.05)(Nb0.8Ta0.2)O3-xBiCoO3 (KNLNT-BC) lead-free piezoelectric ceramics were prepared by the conventional solid-state sintering method.Effects of the BC content on the phase structure,microstructure and electrical properties of KNLNT-BC ceramics were investigated.XRD patterns reveal that all the ceramic samples are in the pure perovskite-type structure,and the phase structure changes from the tetragonal to pseudo-cubic phase with the increase of the BC content.After the substitution of BC,the grain size is significantly reduced and relaxer behaviors are induced.By adding a small amount of BC to KNLNT ceramics,piezoelectric properties are improved,while further addition of BC makes the piezoelectric properties deteriorate markedly.The optimized electrical properties at x =0.005 are as follows:d33 =194 pC/N,kp =0.44.
基金项目
国家自然科学基金(50802029)
教育部新世纪优秀人才支持计划(NCET-11-0630)
Fundamental Research Funds for the Central Universities(12ZX11)
NETL
NSTL
万方数据