Study on properties of tantalum-doped La_(2)Ti_(2)O_(7) ferroelectric ceramics  

作　　者：Chunchun Li Jibran Khaliq Huanpo Ning Xiaoyong Wei Haixue Yan Michael JReece 

机构地区：[1]Electronic Materials Research Laboratory Key Laboratory of the Ministry of Education&International Center for Dielectric Research Xi'an Jiaotong University,Xi'an 710049,P.R.China [2]College of Information Science and Engineering Guilin University of Technology,Guilin 541004,P.R.China [3]School of Engineering and Material Science Queen Mary University of London,London E14NS,UK

出　　处：《Journal of Advanced Dielectrics》2015年第1期34-42,共9页先进电介质学报（英文）

基　　金：supported by the National Basic Research Program of China(2009CB623306);International Science&Technology Cooperation Program of China(2013DFR50470);China Scholarship Council。

摘　　要：A series of ceramics with a general formula,La_(2)Ti_(2-x)Ta_(x)O_(7),in which x=0.05;0.1;0.2;and 0.3,were prepared by Spark Plasma Sintering(SPS).Effects of tantalum substitution for titanium on the structure,dielectric,and piezoelectric properties were studied.Results revealed that the structure changed gradually from 4-layer to 3-layer due to the higher valence of Ta.The solid solution limit of tantalum in La_(2)Ti_(2)O_(7)lattice was in the proximity of x=0.2.The ferroelectric Curie temperature(Tc)decreased with increasing tantalum doping content.dc resistivity reached a maximum value at x=0.2 with a value of~1.0×10^(8)Ωcm at 600℃.The influence of texture on the piezoelectric properties of La_(2)Ti_(2-x)Ta_(x)O_(7)ceramics was also investigated.A maximum d_(33)value~2:1 pC/N was obtained at x=0.2.

关 键 词：Piezoelectric ceramics Curie temperature piezoelectric coefficient 

分 类 号：TQ1[化学工程]