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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。
Nanocrystalline Au-garnet (LuAG) powders were synthesized by solvothermal method. The effects of crystallization temperature and crystallization time on the nucleation and growth of the grains were studied. The results of XRD showed that when the crystallization time was the same, the crystallization temperature was only higher than a certain critical temperature, and the grain structure of LuAG nanopowder tended to be complete with the increase of crystallization temperature. At the same temperature, the crystallization time is longer than a critical time only when the grain precipitation, and with the crystallization time, the grain structure tends to be complete. TEM results show that the LuAG nanopowders obtained under the experimental conditions are spherical, indicating that the growth rate of grain growth in all directions is the same. This solvothermal reaction supports the nucleation / crystallization mechanism of grain growth.