Experimental work is described in this paper demonstrating the feasibility of growing crystals of an incongruently melting compound from its melt, provided that its composition is not far removed from a congruently melting composition. Approximately 60 crystal-growth runs were made from the melt of ammonium dihydrogen orthophosphate (ADP). Crystals of acceptable quality were grown in 10-mm and 25-mm diameters, with pulling rates of 2 mm/h or less and 1 mm/h or less, respectively. Although still rather slow, these growth rates are at least one order of magnitude faster than those obtained in industrial crystal growth from solutions of the same material.
A C Pastor, A C Pastor,
"Growth-From-The-Melt Of ADP Crystals For EO Applications", Proc. SPIE 0681, Laser and Nonlinear Optical Materials, (9 March 1987); doi: 10.1117/12.939621; https://doi.org/10.1117/12.939621