Abstract
We studied the effect of oxygen partial pressure reduction to 0.05% during melt processing of NdBa 2Cu 3O y , EuBa 2Cu 3O y , GdBa 2Cu 3O y , and (Nd,Eu,Gd)Ba 2Cu 3O y on magnetic properties and microstructure. The superconducting transition of all the optimally oxygenated samples was as narrow as in those prepared in pO 2 of 0.1%, the onset temperature of the present samples was slightly higher or at least same as for 0.1% pO 2. Optical and scanning electron microscopy showed that in the GdBa 2Cu 3O y and EuBa 2Cu 3O y clusters are formed of sub-micron sized secondary phase particles. In other two compounds the secondary phase was uniformly dispersed. Magnetic properties of the present samples were always better at low fields than those of the samples prepared in 0.1% pO 2. The irreversibility field data were rather controversial, in some samples improved, in others worse.
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