煅烧
材料科学
钇
氢氧化铵
烧结
氢氧化物
碳酸盐
分散性
碳酸铵
氨
共沉淀
降水
化学工程
无机化学
相(物质)
核化学
冶金
氧化物
催化作用
高分子化学
化学
有机化学
物理
工程类
气象学
作者
Ji Guang Li,Takayasu Ikegami,Jong Heun Lee,Toshiyuki Mori,Yoshiyuki Yajima
标识
DOI:10.1016/s0955-2219(00)00116-3
摘要
YAG precursors were co-precipitated from a mixed solution of aluminum and yttrium nitrates using ammonia water and ammonium hydrogen carbonate as precipitants, respectively. Phase evolution of the precursors during calcination and sinterability of the resultant YAG powders were compared between the two methods. The use of ammonia water produced a hydroxide precursor with an approximate composition of Al(OH)3·0.3[Y2(OH)5(NO3)·3H2O] which transformed to pure YAG at about 1000°C via YAlO3 phase. Severe agglomeration caused poor sinterability of the resultant YAG powders. The use of ammonium hydrogen carbonate produced a carbonate precursor with an approximate composition of NH4AlY0.6(CO3)1.9(OH)2·0.8H2O. The precursor directly converted to pure YAG at about 900°C. The precursor was loosely agglomerated and the resultant YAG powders showed good dispersity and excellent sinterability. For the same calcination temperature of 1100°C, YAG powders from the hydroxide precursor and the carbonate precursor densified to ∼81.2 and ∼99.8% of the theoretical, respectively, by vacuum sintering at 1500°C for 2 h.
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