Hydrothermal crystal growing process

Details Hydrothermal crystal growing process Hydrothermal crystal growing process

C - Chemistry, Metallurgy

30

B

148/2.7

C30B 7/10 (2006.01) C30B 7/00 (2006.01)

Patent

CA 1212600

ABSTRACT HYDROTHERMAL CRYSTAL GROWING PROCESS Large single crystals of berlinite are grown onto seed crystals by maintaining the crystals at a fixed elevated temperature in a pressure vessel con- taining a nutrient of coarse berlinite crystalline powder, held at a fixed lower temperature, and a mix- ture of hydrochloric and phosphoric acids. Because berlinite shows retrograde solubility in the acid mix- ture, the nutrient goes into solution, and berlinite deposits on the higher-temperature growing crystal. Large single crystals of alpha-gallium orthophosphate may be grown using the same apparatus and a similar process. The resultant crystals may be cut into wafers useful in surface acoustic wave devices.

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