Structure degradation and conductivity variation in the perovskite phase of yttrium-barium ceramics
M. U. KalanovInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent, UzbekistanЭ. М. ИбрагимоваInstitute of Nuclear Physics, Academy of Sciences of the Republic of Uzbekistan, Tashkent, Uzbekistan
ABI
Abstract
It is found that the perovskite phase of yttrium-barium ceramics with the composition [(Y,Ba)CuO3−Δ/3]3 under normal conditions is metastable and exhibits atmospheric degradation with time. This degradation results in the formation of an orthorhombic YBa2Cu3O7−δ phase characterized by the superconducting transition at T c =91 K. As a result of the degradation, the conductivity type changes from mixed metallic-semiconductor (ρ(T) = const) to purely metallic in the temperature interval from 100 to 300 K.
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