Abstract
The pseudo-binary NdBa_2Cu_3O_x-Ba_3Cu_<10>O_<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 mixed in argon gas. The liquidus line becomes narrower both in composition and temperature with decreasing oxygen pressure. The crystallization temperature of NdBa_2Cu_3O_x was found to decrease logarithmically with decreasing oxygen content in the atmosphere.
