Abstract:

Neodymium-doped yttrium aluminium garnet（Nd:YAG）powders were synthesized by co-precipitation with forward-titration and reverse-titration，respectively. The phase composition，morphology，particle size distribution of the powders were determined. The powder obtained by forward-titration was of major-phase YAG and a trace amount of YAM with a grain size about 24.7 nm，while the powder by reverse-titration was of pure-phase YAG with a grain size 26.6 nm. The average particle sizes of these powders were 1.26 mm and 1.86 mm respectively. The former was well dispersed with a narrow size distribution. Nd:YAG transparent ceramic was sintered at 1800 ℃ in vacuum. A few pores were observed in the forward-titration sample as compared with a few big holes and more pores at the grain boundaries of the reverse-titration sample. The transmission of the polished samples with thickness of 1mm were 72% and 42% at 1064 nm，65% and 35% at 400 nm respectively.

摘要：

用共沉淀法正滴和反滴工艺制备了掺钕钇铝石榴石（Nd:YAG）粉体。测试了粉体的相组成、显微形貌、粒度分布。结果表明：经1100 ℃煅烧后，正滴工艺得到粉体主相为YAG（Y₃Al₅O₁₂），但有少量的YAM（Y₄Al₂O₉），反滴工艺则得到纯的YAG。晶粒尺寸分别为24.7 nm 和26.6 nm，平均粒径分别为1.26 mm和1.86 mm，前者的粒径分布要窄，分散性要好。采用真空烧结技术在1800 ℃烧结制备了Nd：YAG陶瓷，正滴工艺制备YAG陶瓷晶粒间存在少量气孔，反滴工艺样品存在少量大的孔洞和许多晶界气孔。厚1 mm抛光样品在1064 nm处透过率分别为72%和42%，在400 nm处分别为65%和35%。