Download PDF by N. N. Sheftal’ (auth.), N. N. Sheftal’, E. I. Givargizov: à ОСТ Кà ИСТАЛЛОВ/Rost Kristallov/Growth of Crystals: Volume

By N. N. Sheftal’ (auth.), N. N. Sheftal’, E. I. Givargizov (eds.)

ISBN-10: 1468416898

ISBN-13: 9781468416893

ISBN-10: 146841691X

ISBN-13: 9781468416916

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Additional info for à ОСТ Кà ИСТАЛЛОВ/Rost Kristallov/Growth of Crystals: Volume 9

Example text

Lukina and V. E. Khadzhi The literature carries only restricted information on the crystallization kinetics of zincite under hydrothermal conditions; we find [1,2] only the face growth rates for monohedra as functions of temperature difference D.. T in solutions of KOH and NaOH. Preferential growth along the polar Ls axis leads ultimately to loss of the positive monohedron face. Prolonged growth causes the crystal to be covered with the slowly growing faces only, and the overall growth rate becomes low, which is particularly noticeable when small-area seed plates are used.

1). Figure 2 shows In v == f (l/T), 48 M. M. LUKINA AND V. E. KHADZHI 49 <1l 1il Fig. 1. Growth rate on (0001) as a function of crystallization temperature. ;. 2 Fig. 2. Relation of In V to liT (oK) for (0001). 75 kcal/mole. 6 under hydrothermal conditions. Growth Rate as a Function of Supersaturation The solubility of zinc oxide increases linearly with temperature between 200 and 500°C for alkali solutions [8], so the supersaturation in the growth zone was proportional to ~T, so one could examine the effects of supersaturation.

As the ratio increases, one gets inclusions and then dendritic growth; the curves show that the width of the supersaturation region in which 'b,/vt < 1 is much wider for pure solutions (case a) than it is for contaminated ones (case b). Underneath the curves are shown crystals that grow in identical time periods at various supersaturations and hence at various v/v t for pure solutions (A) and for contaminated ones (B). If the conditions are such that the absolute values of the normal and tangential growth rates are large compared with those that can be provided by diffusion or heat transfer, the latter processes will make a contribution to the production of the faces and the crystal as a whole.

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