At the melt growth process of oxide superconducting material, it has been suggested that liquid-phase solute diffusion controls the crystal growth rate. There has been, however, no experimental evidence showing directly the existence of the diffusion from the primary phase to the peritectic one through the liquid. The authors, using LiBr hydrate as a model material having an incongruent melting point near the ambient temperature, visualized the peritectic crystal growth behavior by means of the optical interferometry technique. The result was that the crystal growth rate measure by the microscope observation is 40% smaller than obtained by analyzing the interference fringe One of the reasons for this discrepancy was attributed to the influence of liquid flow.
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