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On the Origin of Lateral Fringes on Crystals Grown from the Melt
Author(s) -
de Grinberg D. K.
Publication year - 1965
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220100207
Subject(s) - impurity , halide , crystal (programming language) , alkali metal , materials science , crystal growth , condensed matter physics , chemical physics , crystallography , chemistry , optics , physics , inorganic chemistry , organic chemistry , computer science , programming language
Alkali halide single crystals were grown by the Kyropoulos method, using rotatory and fixed seeds. In both techniques, horizontal fringes appear on the lateral surface of the crystals, which are parallel to the interface. The interfringe distance was found to be related with the thermodynamical constants of the material. From the analysis of heat transfer during the growth an expression was deduced which relates the thermodynamical constants, and the crystal and seed dimensions with the rate of growth. This formula is in good agreement with the experimental results. A mechanism of discontinuous growth, based on the effect of impurities at the moving interface, is suggested to explain the appearance of the fringes in both rotatory or fixed seed techniques. This mechanism is also used to interpret the results of other authors, which were not explained by other proposed mechanisms.