化学共沉淀法合成纳米Nd:YAG陶瓷粉体

Preparation of Polycrystalline Nd:YAG Nanopowders via Co-precipitation Method

以碳酸氢铵为沉淀剂,采用化学共沉淀法合成出多晶Nd:YAG纳米陶瓷粉体.采用XRD,SEM,BET等测试手段对粉体的相组成和微观结构进行表征,研究了煅烧温度、反应温度、Al(NO3)3浓度对粉体形貌、粒径以及分散性的影响.结果表明:前驱体在900℃煅烧2 h直接生成Nd:YAG,并且随着煅烧温度的升高,粉体粒径逐渐变大,1 100℃时煅烧所得粉体的平均粒径约为70 nm.反应温度为30～40℃、硝酸铝溶液浓度为0.1～0.2 mol/L时,所得粉体为球形或类球形,分散性最佳.

Polycrystalline nano-sized neodymium doped yttrium aluminum garnet （Nd：Y3Al5O12, Nd：YAG） powders were prepared via a co-precipitation method with ammonium hydrogen carbonate as the precipitant. The evolution of phase composition and morphology of the powders were characterized by XRD, SEM and BET. The effects of the reaction temperature and concentration of AI（NO3）3 on the morphology of the resultant powder were also studied. The results indicated that nano-sized Nd：YAG powders with an average particle size of approximately 50 nm could be directly obtained by calcining the precursor at 900 ℃ for 2 h. The particle size of the Nd：YAG powders became larger with the increase of calcining temperature. Calcining at 1 100 ℃ for 2 h produced Nd：YAG powders with approximate particle size 70 nm. The optimal preparation conditions for well-dispersed Nd：YAG powders were reaction temperature 30-40 ℃ and concentration of Al（NO3）3 0.1-0.2 mol/L, respectively.