Synthesis of Ba0.7Sr0.3TiO3 ceramics via hybrid method

Abstract

Barium strontium titanate (BST) ceramics were prepared by the hybrid method between Solid-state reaction and Sol-gel combustion methods using urea as a fuel. The crystalline powders were prepared by the mixed precursors between Solid-state reaction: Solgel combustion with the molar ratio of 1:0.3 and calcined at 950°C for 2 hours. The BST ceramics were fabricated from calcined powders by sintering at 1050-1350°C and instigated the crystal structures by XRD. All sintering samples have a pure perovskite structure corresponding to JCPDS no. 34-0411. The SEM revealed an increasing of a gain size when with increasing sintering temperature. The highest dielectric constant 11580 was found in the sample prepared at 1350°C for 4 hours with dielectric loss of 0.007.