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
Publication Date (Web): Feb 02, 2014
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Lead-free pseudo-binary compounds (1-x)Ba(Fe1/2Nb1/2)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(Fe1/2Nb1/2)O3. Compound 0.25Ba(Fe1/2Nb1/2)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.
Lead-free, perovskite, permittivity, ceramic, capacitor, magnetic behavior.