Study of Pb(Zr0.65Ti0.35)O3(PZT(65/35) doping on structural, dielectric and conductivity properties of BaTiO3(BT) ceramics

¹Department of Physics, Hemwati Nandan Bahuguna Garhwal University, Srinagar (Garhwal) Campus Pauri, Uttarakhand 246001, India

²Department of Physics, Government Post Graduate College, Gopeshwar (Chamoli), Uttarakhand 246401, India

³Department of Physics, Hemwati Nandan Bahuguna Garhwal University, Srinagar (Garhwal), Campus Pauri, Uttarakhand 246001, India

Adv. Mater. Lett., 2011, 2 (2), pp 148-152

DOI: 10.5185/amlett.2010.11183

Publication Date (Web): Apr 08, 2012

Copyright © IAAM-VBRI Press

E-mail: arun_aksh@rediffmail.com, aksh_arun@rediffmail.com

Abstract

(1−x)BaTiO₃–xPZT(65/35) ceramics were prepared by high temperature solid state reaction technique. Structural properties of the compounds were examined using an X-ray diffraction (XRD) technique to confirm the formation of phase at room temperature. Detailed studies of dielectric properties of (1−x) BaTiO₃–xPZT(65/35) for all compositions were in temperature range 30-200 ^oC reveal that the compound have transition temperature well above at the room temperature. While pure BaTiO₃ ceramics exhibited a sharp phase transformation expected for normal ferroelectrics, phase transformation behavior of the (1−x)BaTiO₃–xPZT(65/35) solid solutions became more diffuse with increasing PZT(65/35) contents. The diffusivity of the dielectric peaks in the compound exhibited the values between 1 and 2 where the higher value indicates the greater disorder in the systems. This was primarily evidenced by an increased broadness in the dielectric peak, with a maximum peak width occurring at x = 0.5. The temperature dependence of ac conductivity indicated that the electrical conductivity decrease above Tc on increasing the PZT(65/35) contents. This increase in the conductivity is attributed to the increase in polarizability of the materials around Tc, due to oxygen vacancies.

Keywords

Perovskite, ferroelectrics, dielectric properties, SEM.