Sol-gel combustion synthesis of Bi0.5Na0.5TiO3-ZrO2 ceramic composite

Bismuth sodium zirconium titanate, belonging to a new class of ceramic composite powders, was prepared by the sol-gel combustion technique. A yellow precipitate was obtained by slow evaporation of precursor solution at 90 °C for 2 h. The final composition of powder is Bi0.5Na0.5TiO3/ZrO2. Small, elongated particles of uniform size and shape were identified with an atomic force microscope. The X-ray diffraction pattern confirms that the final powder is composite in nature and consists of a very distinct phase of bismuth titanate, sodium bismuth titanate and zirconia. The electric permittivity for the samples sintered at 1050 °C is about 640 at 50 Hz.