熔盐法合成SrBi2Nb2O9粉体

以分析纯的Bi2O3,Nb2O5 和 SrCO3为原料,以KCl和NaCl为熔盐,采用熔盐法在800～1000 ℃合成了片状SrBi2Nb2O9粉体.研究了熔盐含量及合成温度对晶体定向生长和粉体形貌的影响.结果表明:与固相法相比,熔盐法是一种有效的晶粒定向生长的方法.制备的粉体呈明显的片状和高度的各向异性,且无团聚现象产生.沿(00l)面择优生长适合的熔盐含量为60;质量分数,随着熔盐含量的增加,晶粒尺寸逐渐增大.合成温度在900 ℃为最优,可获得较大尺寸和高度各向异性的SrBi2Nb2O9粉体.

Preparation of SrBi2Nb2O9 Powders by a Molten Salt Synthesis Process

Plate-like SrBi2Nb2O9 powders were prepared by molten salt synthesis process using Bi2O3,Nb2O5 and SrCO3 as source materials and KCl-NaCl as salt fluxes at 800-1000 ℃.The effects of the molten salt content as well as the synthesized temperature on the grain orientation growth and the morphology of the SrBi2Nb2O9 powders were investigated.The results present that the molten salt synthesis process is an effective way for the development of grain orientation compared with the conventional mixed oxides method,by which the powders appear to be plate-like with high degree anisotropy and without agglomerating.The optimum molten salt content for the preferential growth along(001)is 60 wt %.The grain size increases with the increase of molten salt content and the optimal temperature for obtaining larger size and higher degree anisotropy SrBi2Nb2O9 powders is about 900 ℃.