Structural and electrical properties of 0.7(BiSmxFe1−xO3)–0.3(PbTiO3) composites

Abstract

The 70% BiFeO3 (BFO) with 30% PbTiO3 composite has attracted attention of many researchers, as it falls under MPB (morphotropic phase boundary) region. The studied composites 0.7(BiSmxFe1−xO3)–0.3(PbTiO3) for x = 0.0, 0.05, 0.10, 0.15, 0.20 were synthesized through the conventional route of solid-state reaction. The crystallization, symmetry (rhombohedral), and structural confirmation of the composites have been made through X-ray diffraction technique. The surface morphology of the natural surface is observed employing scanning electron microscope. The dielectric, impedance, and conductivity study reveals the electrical behavior of the samples. The dielectric permittivity is seen to rise with the increase in doping concentration. The high value of dielectric constant (7390.5) found for 10 wt% doping concentration of samarium. The composites are found to show negative temperature coefficient of resistivity behavior in the temperature range (275–350 °C). The relaxation phenomenon is reflected through impedance plots. From these results, it may be concluded that this material may be used for different high-temperature applications.