Na/K RATIOS DEPENDENCE OF PIEZOELECTRIC AND FERROELECTRIC PROPERTIES IN(K_(1-x)Na_(x))TNbO_(3)LEAD-FREE CERAMICS  

作　　者：HONGLIANG DU SHAOBO QU ZHUO XU XIAOYONG WEI WANCHENG ZHOU DONGMEI ZHU LUO FA 

机构地区：[1]The College of Science,Air Force Engineering University Xi'an 710051,P.R.China [2]Electronic Materials Research Laboratory Key Laboratory of Educational Ministry Xi'an Jiaotong University Xi'an 710049,P.R.China [3]State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072,P.R.China

出　　处：《Journal of Advanced Dielectrics》2011年第4期471-478,共8页先进电介质学报（英文）

基　　金：supported by National Natural Science Foundation(No.10804130,No.50872107 and No.60871027);Shaanxi Provincial Natural Science Foundation(No.2009JQ1001);State Key Laboratory of Electrical Insulation and Power Equipment(EIPE10202).

摘　　要：In order to clarify the Na/K ratios dependence of piezoelectric properties,(K_(1-x)Na_(x))TNbO_(3)cer-amics were prepared by conventional solid-state sintering at a=0.4-0.6 with a smaller com-positional interval(0.02 mol).The results demonstrate that the Na/K ratios have obvious effecton piezoelectric and ferroelectric properties of(K_(1-x)Na_(x))NbO_(3)ceramics.Piezoelectric and fer-roelectric properties show the maximum(d_(33)147 pc/N,k_(p)=0.40,and P_(r)=24μC/cm^(2))at=0.54,which is not consistent with conventional viewpoint.The reasons should be attributedto the existence of a phase boundary at a=0.54 mol,which is similar to the morphotropic phaseboundary in Pb(Zr,Ti)O_(3)ceramics.

关 键 词：Lead free piezoelectric ceramics piezoelectric properties morphotropic phase boundary 

分 类 号：TQ1[化学工程]