Hydrothermal process and apparatus for synthesizing...

C - Chemistry – Metallurgy – 01 – B

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23/384, 23/65

C01B 25/36 (2006.01) B01J 3/04 (2006.01) C01B 25/37 (2006.01) C01G 15/00 (2006.01)

Patent

CA 1164627

ABSTRACT Berlinite crystalline powder of uniform parti- cle size and high purity is prepared by repeated thermal cycling to react a mixture of aluminum hydroxide or aluminum oxide and an excess of concentrated phosphoric acid in a sealed pressure vessel. The vessel is prefer- ably held in a horizontal orientation and rotated about a longitudinal axis during the reaction. The product powder is useful in growing large single crystals that have surface acoustic wave applications. Crystalline powder of alpha-gallium orthophosphate may be prepared using the same apparatus and a similar procedure.

394061

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