Abstract
Measurements of the growth rate of NaNbO 3 from a NaBO 2 flux show a linear variation with the supercooling if the crystal is stationary, as expected for solute diffusion-controlled growth. If the crystal is rotated, the growth rate versus supercooling variation is more complex but can be explained in terms of a parabolic kinetic law if allowance is made for solvent evaporation. A model for such a system is proposed. The concentration of flux inclusions indicates clearly the existence of a minimum undercooling below which a very rapid increase in the inclusion concentration occurs. This observation may be explained in terms of the supersaturation gradient criterion.
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