【摘要】 对低温合成纳米 β BiNbO4粉体进行了研究。以Bi和Nb的柠檬酸盐为初始原料 ,采用溶胶凝胶法 ,通过控制适当的 pH值、温度等条件 ,可在 60 0℃的低温下热分解获得高温相 β BiNbO4纳米粉体 ,比普通固相法采用的温度低 40 0℃左右。用红外光谱 ,热重差热分析 ,X射线衍射 ,液氮吸附法以及透射电镜等手段来表征BiNbO4的柠檬酸盐前驱体及煅烧后粉体的各项特性。结果表明 :用柠檬酸盐溶胶凝胶法制得的 β BiNbO4粉体平均粒径约 75nm ,比表面积达 12 .42m2 /g。对形成 β BiNbO4粉体的形成过程及机理进行了初步分析更多还原

【Abstract】 BiNbO 4 powder with nanometer size (≈75 nm) particles was prepared by solgel technique using Bicitrate and Nbcitrate as the starting precursors. The crystalline phase of βBiNbO 4 can be obtained by thermal decomposition of citrate complex precursors at a low temperature of 600 ℃, which is about 400 ℃lower than that of common solid-state reaction process. Infrared spectrum, thermo-gravimetric-differential thermal analysis (TGDTA), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) technique and transmission electron microscopy (TEM) were used to characterize properties of the citrate precursors and the calcined powders. The results show that the average particle size of βBiNbO 4 powder obtained by citrate solgel technique is about 75 nm and the specific surface area is 12.42 m 2/g. The synthesis process and the forming mechanism are also discussed briefly.更多还原