Hydrothermal process and apparatus for synthesizing crystalline

Details Hydrothermal process and apparatus for synthesizing crystalline Hydrothermal process and apparatus for synthesizing crystalline

1981-01-30

1982-04-13

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

156623R, 422209, 422241, 422254, C01B 2536

Patent

active

043247733

ABSTRACT:
Berlinite crystalline powder of uniform particle 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 preferably 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.

REFERENCES:
patent: 3801704 (1974-04-01), Kobayashi et al.
patent: 4049779 (1977-09-01), Ropp
Drafall and Belt, RADC-TR-80-73, Final Technical Report, Mar. 1980, (Rome Air Development Center).

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