Abstract
Eleven different compositions in the system YBa2(Cu3−x Al x Oy(x=0-0.3) have been synthesized and characterized by electrical resistivity measurements, powder X-ray diffraction, and scanning electron microscopy. The superconducting transition temperature,T c (onset), was almost unaffected by the presence of alumina due to its limited solubility in YBa2Cu3O7−x . However,T c(R=0) gradually decreased and the resistive tails became longer with increasing Al2O3 concentration. This was probably due to formation of BaAl2O4 and other impurity phases from chemical decomposition of the superconducting phase by reaction with Al2O3.
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