Strain correlated effect on structural, magnetic, and dielectric properties in Ti4+ substituted Bi0.8Ba0.2Fe1-xTixO3

摘要

Ti4+ substituted Bi0.8Ba0.2Fe1-xTixO3 for x = 0.0, 0.1 and 0.2 are prepared by modified solid state reaction method. The prepared samples sintered at 850 degrees C for 1 h show a single phase nature. A structural change was observed on Ti4+ substitutions are confirmed through X-ray Diffraction, Fourier Transform Infrared spectroscopy and Raman spectra. An anomalous phase transition is observed in Bi0.8Ba0.2FeO3 at 1173 K. The absence of ferroelectric transition and enhancement of decomposition temperature is observed in the substituted samples from the thermal analysis. A dielectric spectroscopic measurement shows that on Ti4+ substitutions, the magnitude of dielectric constant and loss tangent (tan delta) value is decreased. Vibrating Sample Magnetometer (VSM) study shows both antiferromagnetic and ferromagnetic phases coexist in the M=H curve. On Ti4+ substitutions in Bi0.8Ba0.2FeO3, the antiferromagnetism dominates over the ferromagnetic phase. In corroboration to magnetisation process, ZFC-FC measurement confirms it that on Ti4+ substitution, the antiferromagnetic behaviour gets dominated. The report suggests that the interplay of strain upon Ti4+ substitution causes the structural and magnetic phase transition. (C) 2015 Elsevier Masson SAS. All rights reserved.