Investigation of morphotropic phase boundary by rietveld refinement and raman spectroscopy for (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 Ceramics

Abstract

In this paper, the structural properties of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 ceramic system for (x = 0.00, 0.03, 0.05, 0.06, 0.07, 0.08 and 0.1) were studied. Moreover, the samples are obtained through the conventional solid-state method. The effect of calcination temperature ranging from 800 to 1000 ºC was investigated, using X-ray diffraction data and Rietveld refinement method, which permit to verify the morphotropic phase boundary at x = 0.05-0.07. The Raman spectral data were examined by inspecting the changes in their respective peak positions, full width at half maximum (FWHM) and intensities by increasing BaTiO3 composition. It was found that morphotropic phase boundary in the studied system resides at composition of x = 0.05. The analysis of both Rietveld refinement and Raman spectroscopy of the samples showed a distortion of Na0.5Bi0.5TiO3 lattice when Ba2+ ions were added, as well as the ceramic structures underwent a gradual distortion by increasing the composition fraction of BaTiO3.