【摘要】 采用化学共沉淀方法 ,以氧化铌、碳酸镧为主要原料 ,通过液 -液反应和液 -固反应两种途径合成了正铌酸镧 (LaNbO4)无定形前驱体粉末 ,其中液 -液途径反应迅速完全 ;液 -固途径则能获得较均匀的粒度 .采用这两种途径均能获得d50 <1μm的粉末 .对有关机理进行的X射线衍射和扫描电镜 (SEM )分析表明 ,两种途径条件下合成的粉末经 10 0 0℃焙烧后均能获得LaNbO4晶体 ,而两种途径合成过程中的反应机理则完全不同更多还原

【Abstract】 Lanthanum orthoniobate (LaNbO 4) amorphous precursors were prepared by coprecipitation approach, using Nb 2O 5 and La 2(CO 3) 3 as the raw materials. Two methods have been developed. One is in a liquid_liquid system and the other one is in a liquid_solid system. The liquid_liquid method is easy to be realized and completed quickly, while the liquid_solid method has advantage of uniform particle size to be processed. Both the two processes can obtain LaNbO 4 with d 50 <1 μm. Powder characteristics before and after calcinations were studied by X _ray diffraction, and the morphology of the particles was studied by SEM micrograph. The result shows that while both methods can obtain LaNbO 4 crystalline after being calcined under 1 000 ℃, the reactions and mechanisms involved are quite different.更多还原