Abstract
The effects of solute-to-solvent (NdBa2Cu3Ox/Ba3Cu10O13) molar ratio and cooling rate on the nucleation temperature of NdBa2Cu3Ox have been observed in situ using high temperature optical microscopy. The nucleation temperature was found to increase logarithmically with the molar ratio NdBa2Cu3Ox/Ba3Cu10O13, which indicated that the nucleation mechanism is same for both high temperature solutions and peritectic melts. The nucleation temperature was found to decrease with increasing cooling rate. The energy dispersive X-ray analysis (EDX) measurements of the NdBa2Cu3Ox crystals indicated that a partial substitution for Ba sites by Nd occurred and, the substitution was independent of the NdBa2Ox/Ba3Cu10O13 molar ratio. These results were confirmed by growing the NdBa2Cu3Ox crystals in a horizontal tubular furnace.
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