中文摘要：

采用溶剂热法合成了镥铝石榴石（LuAG）纳米粉体,研究了晶化温度和晶化时间对晶粒成核和生长的影响规律。XRD的结果发现晶化时间相同时,晶化温度只有高于某一临界温度时才有晶粒析出,而且随着晶化温度的升高,LuAG纳米粉体的晶粒结构趋于完整;晶化温度相同时,晶化时间也只有长于某一临界时间时才有晶粒析出,而且随着晶化时间的延长,晶粒结构趋于完整。TEM的结果表明实验条件下得到的LuAG纳米粉体为球形,说明晶粒生长沿各个方向的生长速率是相同的。这一溶剂热反应过程支持了晶粒生长的成核/晶化机理。

英文摘要：

Lutetium aluminum garnet （LuAG） nanopowders were synthesized by solvothermal method. The influence of aging temperature and aging time on the grain nucleation and growth was investigated. It was found from XRD results that for a fixed aging time, LuAG nanopowders were obtained just above the critical temperature and with increasing aging temperature, the structures tended to be more complete. The same effect was observed for a fixed aging temperature, the nucleation required longer than the critical time and the structures tended to be more complete when the aging time was prolonged. It was also shown that the rate of grain growth along different directions was isotropic based on TEM results of spherical LuAG nanopowders. The solvothermal reaction process supported nucleation/crystallization mechanism of grain growth.