Structural, Dielectric And Magnetic Properties Of 0.3CoFe2O4-0.7BaTiO3-PVDF Composite Film

Smart Materials Research Laboratory, Department of Physics, Indian Institute of Technology, Roorkee, Roorkee 247667, India

Adv. Mater. Lett., 2014, 5 (11), pp 652-657

DOI: 10.5185/amlett.2014.4567

Publication Date (Web): Nov 09, 2014

Copyright © IAAM-VBRI Press

E-mail: klyadav35@yahoo.com

Abstract

Structural, Dielectric and magnetic properties 0.3 CoFe₂O_4–0.7 BaTiO₃–PVDF (polyvinylidene fluride) composite film with different concentration of PVDF: 20, 30 and 40 wt% are reported here for the first time. The structural analysis was carried out using X-Ray diffraction technique, which indicates cubic spinel structure for ferrite phase CoFe2O₄ (CFO) and tetragonal structure for ferroelectric phase BaTiO₃ (BT). The average grain size was observed to be (~106 nm, 30 nm and 26 nm) for 20%, 30% and 40% addition of PVDF by using AFM analysis. The dielectric constant variation with temperature at three fixed frequencies (1 kHz, 50 kHz and 100 kHz) was studied and it was found that the dielectric constant and dielectric loss decrease with increasing amount of polyvinylidene fluride. The values of ac conductivity for 0.3CoFe2O₄ – 0.7BaTiO₃ –PVDF composite film were found to decrease with increasing concentration of PVDF. The ferroelectric hysteresis loops also indicate that the value of polarization decreases with the addition of PVDF and the value of remnant polarization for 20% PVDF was found to be 0.5286 µC/cm². The magnetocapacitance of 0.3 CoFe2O₄–0.7 BaTiO₃–0.3 PVDF was found higher for this composition.

Keywords

Composite film, dielectric properties, ferroelectric, multiferroic