Structural investigation and dielectric studies on Mn substituted Pb(Zr 0.65Ti 0.35)O 3 perovskite ceramics

Abstract

Polycrystalline samples of manganese substituted lead zirconium titanate (PZMT) with general formula Pb(Zr 0.65− x Mn x Ti 0.35)O 3 ceramics have been synthesised by high temperature solid state reaction technique. X-ray diffraction (XRD) patterns were recorded at room temperature to study the crystal structure employing Rietveld technique. All the patterns could be refined to R3c space group with rhombohedral symmetry. Bond lengths and angles have been calculated from refined parameters. Microstructural properties of the materials were analysed by scanning electron microscope (SEM) and compositional analysis were carried out by energy dispersive spectrum (EDS) measurements. All the materials exhibit ferroelectric to paraelectric transition. The Curie temperature ( T c) increases with the Mn concentration. We have observed that dielectric constant decreases and AC conductivity increases with the frequency. The correlation between lattice parameters and T c for the present samples has been observed.