Growth of AlPO.sub.4 crystals

Details Growth of AlPO.sub.4 crystals Growth of AlPO.sub.4 crystals

1980-11-03

1981-11-17

Vertiz, O. R.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156DIG1, C30B 710

Patent

active

043009794

ABSTRACT:
AlPO.sub.4 crystals are isomorphic with quartz and are expected therefore to have several crystal orientations in which the elastic (piezoelectric) constants are relatively insensitive to temperature. The piezoelectric coupling coefficients of AlPO.sub.4 are approximately three times those of quartz. Hydrothermal growth techniques to date have been marginal, and all have employed H.sub.3 PO.sub.4 as the hydrothermal solution. We describe using HCl as the hydrothermal solution and demonstrate the superiority of HCl from the standpoint of solubility and consequent crystal growth rate.

REFERENCES:
patent: 3567643 (1971-03-01), Flanigen et al.
patent: 3634044 (1972-01-01), Parker
patent: 3723337 (1973-03-01), Yancy
patent: 4247358 (1981-01-01), Aucoin et al.
Pamplin, Crystal Growth, Second Edition, vol. 16, Permagon Press (1980), pp. 464-466.

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