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On the morphological instability of the growing crystals (III). Micro‐interferometric investigations of the morphological stability of KDP crystals growing from aqueous solutions

1988; Wiley; Volume: 23; Issue: 9 Linguagem: Inglês

10.1002/crat.2170230902

1521-4079

M. I. Staynova, Chr. Nanev,

Nonlinear Optical Materials Research

Abstract The paper is aimed at the elucidation of the limits to which the faceted forms of KDP crystals preserve their stability and beyond which a skeletal growth from stagnant solutions takes place. In order to avoid the natural convections the experiments were performed in two‐dimensional cells. On the basis of quantitative criteria, it has been shown that the kinetic regime of growth has been replaced by a diffusion one when the concentration on the crystal surface drops with respect to the bulk value with 0.1% to 0.2%. The critical size above which the KDP crystal no longer retains its polyhedral growth mode in a diffusion regime since a gross morphological defect in the form of a depression appears on its (010) face has been compared with the theoretical expressions derived by Cahn and Chernov.