Hydrothermal crystal growing process and apparatus

Details Hydrothermal crystal growing process and apparatus Hydrothermal crystal growing process and apparatus

C - Chemistry, Metallurgy

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B

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C30B 29/14 (2006.01) C01B 25/36 (2006.01) C30B 7/00 (2006.01) H03H 3/08 (2006.01)

Patent

CA 1191076

ABSTRACT HYDROTHERMAL CRYSTAL GROWING PROCESS AND APPARATUS 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 concen- trated phosphoric acid. Because berlinite shows retro- grade solubility, the nutrient goes into solution, and berlinite deposits on the higher-temperature growing crystal. The vessel is rocked to promote motion of saturated solution to the crystal and depleted solution to the nutrient. 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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