A YAlO3 (hexagonal) solid solution with a = 0.3678 nm and c = 1.046 nm crystallizes at 880-935 degreesC from an amorphous material prepared in the mole ratio Y3+/Al3+ = 3 : 5 by a sol-gel technique using hydrazine. The hexagonal YAlO3 phase transforms to Y3Al5O12 (YAG) at 1005-1075 degreesC. The YAG powder calcined at 1200 degreesC can be densified to transparency under vacuum for 2 h at 1600 degreesC without additives. (C) 2001 Elsevier Science Ltd. All rights reserved. References: 21
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