Synthesis and characterization of lead-free ternary component BST-BCT-BZT ceramic capacitors

作     者：Venkata Sreenivas Puli Dhiren K.Pradhan Brian C.Riggs Shiva Adireddy Ram S.Katiyar Douglas B.Chrisey 

作者机构：Department of Physics and Engineering Physics Tulane UniversityNew Orleans-LA 70118USA Department of PhysicsUniversity of Puerto Rico San Juan-00936PRUSA 

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

年 卷 期：2014年第4卷第2期

页      面：51-59页

学科分类：07[理学] 0701[理学-数学] 070101[理学-基础数学] 

基　　金：supported by the National Science Foundation under grant NSF-EFRI RESTOR#1038272 

主　　题：Crystal structure dieletric properties energy storage electrical properties 

摘      要：Polycrystalline sample of lead-free 1/3(Ba_(0.70)Sr_(0.30)TiO_(3))+1/3(Ba_(0.70)Ca_(0.30)TiO_(3))+1/3(BaZr_(0.20)Ti_(0.80)O_(3))(BST-BCT-BZT)ceramic was synthesized by solid state reaction *** purity and crystal structure of as-synthesized materials was confirmed by X-ray diffraction(XRD).Temperature-dependent dielectric permittivity studies demonstrated frequency independent behavior,indicating that the studied sample has typical diffuse phase transition behavior with partial thermal hysteresis.A ferroelectric phase transition between cubic and tetragonal phase was noticed near room temperature(~330 K).Bulk P-E hysteresis loop showed a saturation polarization of 20.4μC/cm^(2) and a coercive field of~12.78 kV/cm at a maximum electric field of~115 kV/*** dielectric constant(ε~5773),low dielectric loss(tanδ~0.03)were recorded at room *** energy density of 0.44 J/cm^(3) and charge energy density of 1.40 J/cm^(3) were calculated from nonlinear ferroeletric hysteresis loop at maximum electric *** constant at variable temperatures and electric fields,ferroeletric to paraelectric phase transition and energy storage properties were thoroughly discussed.