Abstract
AbstractThe mechanism of crystal growth from undercooled melts is studied experimentally by means of a simple capillary technique. Thymol and Na2S2O3 · 5 H2O are used as model substances. Dislocation‐free crystal faces of these compounds are obtained by continuous growth in the capillary or by prolonged annealing under appropriate conditions. Two‐dimensional mechanism of growth was experimentally verified on such perfect crystal planes. The conditions under which the surface nuclation mechanism operates are described accounting for the supersaturation, the influence of impurities etc. Transition from two‐dimensional into spiral growth of purposedly defected crystal faces is demonstrated and investigated. The mechanism of formation of perfect crystals is discussed and further experimental evidence on the possibility of two‐dimensional growth from melts is given.
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