Lattice strain driven dielectric insulation response of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9) ceramics

作     者：Vaibhav Shrivastava 

作者机构：Department of PhysicsShiv Nadar University Gautam Buddha Nagar 203207Uttar PradeshIndia 

出 版 物：《Journal of Advanced Dielectrics》 (先进电介质学报（英文）)

年 卷 期：2016年第6卷第3期

页      面：50-55页

学科分类：081702[工学-化学工艺] 08[工学] 0817[工学-化学工程与技术] 

主　　题：Lattice strain microstructure dielectric constant dielectric loss dc conductivity 

摘      要：In this paper,effects of lttice strain on dielectric properties of Sr_(1-x)Ca_(x)Bi_(2)Nb_(2)O_(9)(x=0.0-0.5 in steps of 0.1)ceramics are *** frequency dipolar polarization is observed to increase for 10%calcium addition and suppresses thereafter on higher calcium *** dielectric loss values for all doped samples were lower compared to undoped one at frequencies beyond 1 *** sample with x=0.1 shows room temperature dielectric constant in the range(130±12)over a wide frequency range from 50Hz to 1 MHz also minimum dielectric loss among all other sample for the same frequeny *** increase in Curie temperature(T_(c))by 50℃ is recorded in the present work by increasing 10%calcium content in SBN *** higher doped samples indicate increase in T_(c) by further higher *** addition,dc conductivity of all samples is measured for all samples and increase in calcium content is observed to generate more insulating compositions compared to undoped SBN with higher intrinsic activation energies.