The Structural, Electrical And Magnetic Properties Of Perovskite (1-x)Ba(Fe1/2Nb1/2)O3–xBaTiO3 Ceramics

¹University Department of Physics, T.M. Bhagalpur University, Bhagalpur 812007, India

²Department of Physics, S.M. College, Bhagalpur 812001, India

³Department of Physics, Patna Women’s College, Patna 800001, India

⁴Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology, Mumbai 400076, India

Adv. Mater. Lett., 2014, 5 (3), pp 117-121

DOI: 10.5185/amlett.2013.fdm.28

Publication Date (Web): Feb 02, 2014

Copyright © IAAM-VBRI Press

E-mail: k.prasad65@gmail.com

Abstract

Lead-free pseudo-binary compounds (1-x)Ba(Fe_1/2Nb_1/2)O₃–xBaTiO₃; (0 ≤ x ≤ 1) have been synthesized at 1200°C using conventional ceramic technique and characterized by X-ray diffraction, scanning electron microscopy, dielectric and vibration sample magnetometer studies. The crystal structure of the compounds is found to be monoclinic with the space group P2/m except for BaTiO₃ for which it is tetragonal (P4/mmm). The incorporation of BaTiO₃ significantly reduces the dielectric loss and improve the frequency and temperature stability of the dielectric properties of Ba(Fe_1/2Nb_1/2)O₃. Compound 0.25Ba(Fe_1/2Nb_1/2)O₃-0.75BaTiO₃ exhibited a low value of temperature coefficient of capacitance (< ±3%) in the working temperature range (up to +85°C), room temperature dielectric constant equal to 282 and low loss tangent (~10-2) which meets the specifications for “Z5D” of Class II dielectrics of Electronic Industries Association. Hence, this composition might be a suitable candidate for capacitor applications. Besides, magnetic studies indicated the possibility of magneto-electric coupling in the system.

Keywords

Lead-free, perovskite, permittivity, ceramic, capacitor, magnetic behavior.