Pure lithium tantalite ceramic powders were synthesized by a molten salt method with Li2CO3 and Ta2O5 as reactants and LiCl as flux. The products were characterized by DSC, XRD and SEM techniques. The results show tha...Pure lithium tantalite ceramic powders were synthesized by a molten salt method with Li2CO3 and Ta2O5 as reactants and LiCl as flux. The products were characterized by DSC, XRD and SEM techniques. The results show that the pure LiTaO3 powder is rhombohedral system with space group of R3c. The particle sizes are influenced by the synthesis temperature. The particle size increases with reaction temperature.展开更多
文摘Pure lithium tantalite ceramic powders were synthesized by a molten salt method with Li2CO3 and Ta2O5 as reactants and LiCl as flux. The products were characterized by DSC, XRD and SEM techniques. The results show that the pure LiTaO3 powder is rhombohedral system with space group of R3c. The particle sizes are influenced by the synthesis temperature. The particle size increases with reaction temperature.
文摘以钛酸丁酯、硝酸锌、乙醇和乙酸为原料,采用溶胶-凝胶工艺制备了纯净六方ZnTiO_3粉体.利用TG-DTA、XRD和FE-SEM等检测手段对前驱体凝胶的热分解、相变以及粉体结构和形貌进行研究.结果表明:ZnTiO_3凝胶前驱体热分解分3个阶段,第1阶段在262℃以下主要为有机物的分解过程;第2阶段为262~700℃,此时的粉体为非晶态立方相ZnTiO_3;六方ZnTiO_3相的生成发生在第3阶段700~900℃.获得纯净六方ZnTiO_3相的较为合适的工艺条件为:前驱体在60℃进行溶胶,然后在700~900℃煅烧2 h.
