Impedance and a.c. conductivity studies of Ba(Pr1/2Nb1/2)O3 ceramic

Bulletin of materials science

A R Kulkarni²  K P Chandra⁴  K Prasad³  K Amar Nath¹ 

[1] University Department of Physics, T.M. Bhagalpur University, Bhagalpur 812 007, India$$University Department of Physics, T.M. Bhagalpur University, Bhagalpur 812 007, IndiaUniversity Department of Physics, T.M. Bhagalpur University, Bhagalpur 812 007, India$$;Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Mumbai 400 076, India$$Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Mumbai 400 076, IndiaDepartment of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Mumbai 400 076, India$$;Centre for Applied Physics, Central University of Jharkhand, Ranchi 835 205, India$$Centre for Applied Physics, Central University of Jharkhand, Ranchi 835 205, IndiaCentre for Applied Physics, Central University of Jharkhand, Ranchi 835 205, India$$;Department of Physics, S.M. College, Bhagalpur 812 001, India$$Department of Physics, S.M. College, Bhagalpur 812 001, IndiaDepartment of Physics, S.M. College, Bhagalpur 812 001, India$$

关键词: Ba(Pr1/2Nb1/2)O3;    perovskite structure;    impedance spectroscopy;    permittivity;    electrical conductivity.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Impedance and electrical conduction studies of Ba(Pr_1/2Nb_1/2)O₃ ceramic prepared through conventional ceramic fabrication technique are presented. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single-phase cubic structure with space group . EDAX and SEM studies were carried out to study the quality and purity of compound. To find a correlation between the response of the real system and idealized model circuit composed of discrete electrical components, the model fittings were presented using impedance data. Complex impedance as well as electric modulus analyses suggested dielectric relaxation to be of non-Debye type and negative temperature coefficient of resistance character. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in Ba(Pr_1/2Nb_1/2)O₃. The a.c. conductivity data were used to evaluate density of states at Fermi level, minimum hopping length and apparent activation energy.

【 授权许可】

Unknown