Hydrothermal Synthesis of Oxide and Carbonate Powders of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 Ceramics

M. Mesrar1, T. Lamcharfi1, N.S. Echatoui1, F. Abdi1 and F.Z. Ahjyaje2

1Signals, Systems and Components Laboratory (LSSC), Université Sidi Mohamed Ben Abdellah, Faculté des Sciences et Techniques de Fès, Imouzzer Road, B.P. 2202, Fes, Morocco

2Laboratory of Materials, Natural Substances, Environment and Modeling, Polydisciplinary Faculty of Taza, Université Sidi Mohamed Ben Abdellah, Imouzzer Road, B.P. 2202, Fes, Morocco

*Corresponding author: E-mail: nor-said.echatoui@usmba.ac.ma

Abstract

In this study, the synthesis of ferroelectric (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 ceramics have been successfully prepared via a hydrothermal process, using bismuth oxide and barium carbonate. The characterization is done using X-ray diffraction, scanning electron microscope, Raman spectroscopy and dielectric measurements. The XRD patterns recorded at room temperature confirmed the formation of a single phase with rhombohedral structure. There is a transformation in crystal structure from rhombohedral to coexistence of rhombohedral and tetragonal to a single tetragonal phase with the increase in BaTiO3 concentration in basic (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 composition. From SEM microscopy, the particle sizes are estimated in the range of 5-24 μm. The analysis of both Raman and the spectral deconvolution data of our samples also indicated the distortion of (1-x)(Na0.5Bi0.5)TiO3-xBaTiO3 lattice with the addition of Ba2+ ion. Rietveld refinement method allows us to verify the morphotropic phase boundary at x = 0.05-0.07. The dielectric properties of the solid solution increase with a rise in Ba-TiO3 content and shows optimum value at x = 0.07 owing to the co-existence of two ferroelectric phases. Based on these results, it is proved that morphotropic phase boundary in the studied system is included in the composition x = 0.05 and 0.07.

Keywords

(Na0.5Bi0.5)TiO3, Hydrothermal method, Reitveld refinement, Raman spectroscopy, Dielectric measurements.

   View Article PDF File Under a Creative Commons License