【作者】 顾浩； 宋连仁； 何静贞；

【Author】 Gu Hao;Song Lianren;He Jingzhen Jiangsu College of Chemical Engineering, Changzhou Changchun Institute of Applied Chemistry, Academia Sinica The decomposition of blocky or powdered crystals of YAP in vacuum or under Ar atmo-sphere at 1650-1700℃ in graphite resistance furnace has been studied by chemical analy- sis, X-ray diffraction and SEM observation. The YAP crystal was unstable in above men-tioned conditions owing to the reducing atmosphere produced by graphite. Al was lost byvolatilization, forming aluminium bead in the cool region of the graphite crucible tray, andYAM (and Y_2O_3) remained. A lot of holes were observed on the surface of YA type crys-tals. It is supposed that decomposition takes place at these active sites In the similar con-dition YAG crystal is aiso unsatble as YAP. The "sweating" phenomena, may be causedjust by the unstability of YAP.

【机构】 江苏化工学院； 中国科学院长春应用化学研究所； 中国科学院长春应用化学研究所 常州；