PLATE-LIKE SrBi_2Nb_2O_9 POWDERS PREPARED BY THE MOLTEN SALT METHOD

Purely plate-like SrBi2Nb2O9 ceramic powders with anisotropy were prepared by the molten salt method, using Bi2O3, Nb2O5 and SrCO3 as raw materials in molten salt fluxes of NaCl-KCl at 800-1150℃. The X-ray diffraction patterns reveal that single phase SrBi2Nb2O9 powder can be obtained by the molten salt method, and scanning electron microscope photographs show that the SrBi2Nb2O9 powders appear to be plate-like and without aggregation, and to have a high degree anisotropy. The effect of the reaction temperature and content of molten salt on the particle size were investigated. Results show that the SrBi2Nb2O9 powders particle size and the level of anisotropy increase with the increase of reaction temperature and content of molten salt, when the mass ratio of salt and raw material≤1. Furthermore, the mechanism of the molten salt technique is briefly discussed.