Sintering temperature, microstructures and electrical properties of (Na1/2Bi1/2)0.94Ba0.06Ti0.97(Mg1/3Nb2/3)0.03O3 ferroelectric ceramic

Abstract

Polycrystalline lead-free (Bi1/2Na1/2)0.94Ba0.06 Ti1-x(Mg1/3Nb2/3)xO3 ceramic sample with x = 0.03 was prepared using a high-temperature solid-state reaction method. X-ray diffraction analyses indicated the formation of single-phase rhombohedral structure at 950°C calcinations temperature. The values of apparent particle size and lattice strain were seen to increase with the addition of 3 % of MgO & Nb2O5. Sintering was carried out at various temperatures ranging from 1100°C to 1200°C at 10°C increase. The effects of sintering on the characteristics of the ceramic sample were investigated. Microstructure investigation revealed improved homogeneity and uniform fine grain sizes at the optimal sintering temperature. The sample sintered at 1150°C has a better relative density (98 %) & electrical properties.

Keywords

• polycrystalline
• sintering
• microstructure
• dielectric
• ferroelectric