The Controlled Powders Morphology of Bismuth Niobium Titanate Depending upon the Isothermal Annealing

Abstract

In order to investigate the effect of isothermal annealing on the powder morphology, Bi3NbTiO9 powders were first synthesized by molten salt method and then calcinated at different temperatures for different dwelling time. The microstructure observation revealed that the crystal morphology of Bi3NbTiO9 powder changed greatly with the prolonged dwelling time. The powders started to change from cube to sphere in shape with the dwelling time prolonged to 240min and then became cube again as the dwelling time was prolonged beyond 360min at 850oC. In addition to a time-dependent particle evolution study, we explored primarily the original drive force of morphology transform from the viewpoint of dynamics.