Glassy behavior study of dysprosium doped barium zirconium titanate relaxor ferroelectric  

作　　者：Tanmaya BADAPANDA 

机构地区：[1]Department of Physics,CV Raman College of Engineering,Bhubaneswar,Odisha-752054,India

出　　处：《Journal of Advanced Ceramics》2014年第4期339-348,共10页先进陶瓷（英文）

摘　　要：We report the glassy behavior of dysprosium doped barium zirconium titanate single phase perovskite ceramics with general formula Ba_(1-x)Dy_(2x/3)Zr_(0.25)Ti_(0.75)O_(3)prepared by solid-state reaction method.Temperature and frequency dependent dielectric studies of the ceramics reveal relaxor behavior.A non-Debye relaxation,which is analogous to the magnetic relaxation in spin-glass system,is observed clearly around temperature of dielectric permittivity maximum(Tm).Frequency dependence of Tm governed by production of polar nano-regions is analyzed using Debye relation,Vogel-Fulcher(V-F)relation and power law.A clear change in dynamic behavior is observed by power parameter which is related to growth of interactions between polar nano-regions with different composition.Various parameters like activation energy for relaxation,freezing temperature,relaxation frequency,etc.,are determined after non-linear curve fitting.Temperature dependence of dielectric constant at temperatures much higher and lower than Tm is analyzed by two exponential functions,which gives an idea about the production of polar clusters at high temperature and distribution of freezing temperatures at lower temperature.Various other associated parameters are calculated by non-linear curve fitting and their significance has been explained.

关 键 词：diffuse phase transition transition temperature dielectric properties RELAXORS polar nano-regions 

分 类 号：TG1[金属学及工艺—金属学]