Structural, dielectric and electrical properties of BaSnO3 and BaSeO3 modified Bi0.5Na0.5TiO3 ceramics

Abstract

In this communication, preliminary structural and detailed electrical (dielectric, polarization, impedence, and conductivity) characteristics of BaSnO3 and BaSeO3 modified complex Bi0.5Na0.5TiO3 ceramics with a general chemical formula and composition, (1–2x)[(Bi0.5Na0.5) TiO3]+x(BaSnO3)+x(BaSeO3) (with x = 0, 0.05, 0.1, 0.15) (BNT–BSn–BSe) ceramics, synthesized by a high-temperature mixed-oxide technique (calcinations temperature = 925 °C and sintering temperature = 950 °C, for time = 4 h each) have been reported. Analysis of room temperature X-ray diffraction data has confirmed the formation of single phase perovskite of BNT–BSn–BSe in rhombohedral phase and provided crystal data. Studies of impedance spectroscopy and electrical conductivity of the materials in a frequency range of (1 kHz-1MHz) at different temperatures (25–500 °C) have shown the composition (x) effect on electrical characteristics of BSn and BSe modified BNT.The electric field dependent polarization study at room temperature exhibits the existence of ferroelectricity in the materials. Study of the impedance spectroscopy through Nyquist plots shows the contributions of the grains and grain boundary in the resistive and capacitive properties of the materials. This study also determines the existence of NTCR (negative temperature coefficient of resistance) behavior the prepared materials. The J–E characteristics demonstrate the Ohomic behavior with slope closer to 1.