TEMPERATURE-INDEPENDENT DIELECTRIC PROPERTIES OF 0.82[0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)]-0.18K_(0.5)Na_(0.5)NbO_(3)CERAMICS  

作　　者：YANG LIU ZHUO XU YUJUN FENG 

机构地区：[1]Electronic Materials Research Laboratory Xi'an Jiaotong University,Xi'an 710049,P.R.China [2]International Center for Dielectric Research Xi'an Jiaotong University,Xi'an 710049,P.R.China

出　　处：《Journal of Advanced Dielectrics》2012年第1期86-91,共6页先进电介质学报（英文）

基　　金：supported by the Ministry of Sciences and Technology of China through 973-project(Grant No.2009CB623306);the National Natural Science Foundation of China-NSAF(Grant Nos.10976022,10875095 and 50872107);International Science&Technology Cooperation Program of China(Grant No.2010DFR50480).

摘　　要：In order to explore the high temperature stability of ceramic capacitor,we present temperatureindependent dielectric properties of 0.82[0.94Bi_(0.5)Na_(0.5)TiO_(3)-0.06BaTiO_(3)]-0.18K_(0.5)Na_(0.5)NbO_(3)(BNT-BT-18KNN)ceramics.For different sintered temperature and annealing treatment,the pseudoternary system showed aεr of 2265 at 1 kHz at 35℃with a normalized permittivity ε/ε35℃varying less than±15%from 11℃to 382℃.This pure perovskite phase with slimmer and heat proof P
E loops possessed energy density of 0.616 J/cm^(3)with a tolerance of about3%in a temperature interval ranging from 20℃to 120℃,which is higher and more temperature stable than most ceramic capacitors,such as PLZST and 0.89BNT
0.06BT
0.05KNN.This relaxor ferroelectric(at room temperature)with parabolic bipolar strain
electric(S(E))curve showed a quite low temperature dependence of positive strain with less than±6.5%tolerance from the average value of 0.091%between 20℃and 120℃,which is also more temperature stable than the same composition Zhang et al.reported.These merits demonstrate that the newly produced BNT-BT-18KNN ceramics should be a promising candidate for the development of high-temperature capacitor and actuator materials.

关 键 词：Lead-free ceramics slimmer hysteresis loops temperature-independent 

分 类 号：TQ1[化学工程]