Abstract
The pseudo-binary NdBa 2Cu 3O x –Ba 3Cu 10O 13 phase diagrams and the crystallization of NdBa 2Cu 3O x have been in situ observed using high-temperature optical microscope under three different oxygen atmospheres namely 1%, 0.1% and 0.0097% oxygen in argon. It has been observed that the liquidus line becomes narrower both in composition and temperature with decreasing oxygen pressure. This result suggested that under reduced oxygen atmosphere, the NdBa 2Cu 3O x crystals could only be grown from a peritectic melt consisting of Nd 4Ba 2Cu 2O 10 and liquid. The crystallization temperature of NdBa 2Cu 3O x was found to decrease logarithmically with decreasing oxygen content in the atmosphere.
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