BaBi2Nb2O9 powder and their ceramics prepared by aqueous solution–gel method

Abstract

BaBi2Nb2O9 powders and their ceramics were prepared by aqueous solution–gel method. The phase evolution and microstructure of samples including powders and ceramics were determined by X-rays, SEM. An homogenous BaBi2Nb2O9 powder was observed after thermal treatment at the temperature as low as 400 °C. The texture phenomena has been observed in the ceramics during the process of sintering, the size and area of oriented grains increased with increase the sintering temperature, and the grain growth occurs in preferential direction which is parallel to the plane of the ceramic plate. The density of this ceramics has been determined, the study revealed that the density increases with sintering temperature and reached a maximum at 1,000 °C and then decreases gradually. The characteristic diffuse phase transition of the BaBi2Nb2O9 ceramics was observed at about 200 °C.