Impedance and a.c. conductivity studies on Ba(Nd0.2Ti0.6Nb0.2)O3 ceramic prepared through conventional and microwave sintering route

Bulletin of materials science

Syed Mahboob¹  G Prasad¹  G S Kumar¹ 

[1] Department of Physics, Osmania University, Hyderabad 500 007, India$$Department of Physics, Osmania University, Hyderabad 500 007, IndiaDepartment of Physics, Osmania University, Hyderabad 500 007, India$$

关键词: Barium titanate;    impedance;    grain/grain boundary resistance and capacitance;    grain/grain boundary relaxation frequency;    electrical conductivity;    hopping mechanism.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Electrical conduction studies on Ba(Nd_0.2Ti_0.6Nb_0.2)O₃ ceramic samples prepared through conventional and microwave sintering route are presented in this paper. D.C. and a.c. conductivities of these samples as a function of temperature from 300â€�??900 K have been studied. Two types of conduction processes are evident from the frequency dependant conductivity plots, i.e. low-frequency conduction due to short-range hopping and high-frequency conduction due to the localized relaxation (reorientational) hopping mechanism. Grain and grain boundary contributions to the conductivity in these samples are obtained from impedance/admittance measurements via equivalent circuit modelling.

【 授权许可】

Unknown