Abstract
The pseudo-binary phase diagram between NdBa 2Cu 3O x and Ba 3Cu 10O 13, and the nucleation and growth of NdBa 2Cu 3O x in air have been observed in situ using high-temperature optical microscopy. It has been observed that NdBa 2Cu 3O x melts peritectically (NdBa 2Cu 3O x →Nd 4Ba 2Cu 2O 10+L) at 1098°C for the (1/13) Ba 3Cu 10O 13 composition range of 0–60 mol% and forms a high-temperature solution in 60–100 mol% at 922–1098°C. The in situ observations of crystallization of NdBa 2Cu 3O x from high-temperature solutions reveal that the growth mechanism depends on the cooling rate. The morphological changes from polyhedral via stacked to dendritic crystals with increasing supercooling were clearly observed. In contrast, the growth morphology for crystals grown from peritectic melt was independent of the cooling rate, which indicated that solute diffusion is the rate-limiting factor.
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