Abstract
The growth rate of YBa 2Cu 3O 7−x (Y123) bulk crystal was found to reduce to almost zero under the undercooled constant temperature condition before the crystal front reached the sample end. From the evaluation of the Y211 volume fraction, the Y211 particles were accumulated in the liquid phase ahead of the Y123 growth interface, and the volume fraction was almost the same in all samples when the growth rate reduced to almost zero. This decrease of growth rate was considered to be caused by the high volume fraction of Y211 particles in the liquid, that is, the high volume fraction in the liquid would limit solute diffusion and enhance the compositional shift in the boundary layer. A simple growth model is proposed for explaining this non-steady growth phenomenon and shows a similar tendency with the experimental results.
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