Abstract
Two series of single phase triple-perovskite superconducting samples with nominal compositions of Gd(Ba 2−xCa x)Cu 3O y (Ca series, 0 ≤ x ≤ 0.30) and Gd(Ba 2−xSr x)Cu 3O y (Sr series, 0 ≤ x′ ≤ 1.0) were prepared. Orthorhombicity decreases with increasing amount of Ca or Sr substitution. Part of Ca ions occupy R site and push the same amount of Gd 3+ ion into Ba site, attracting negative oxygen ions to randomly occupy O(4) and O(5) sites on the basal plane which leads to a further reduction of orthorhombicity in Gd(Ba 2−xCa x)Cu 3O y series compared with the same amount of substitution in Sr series, in which, Sr only occupies the Ba site. T c is dependent on the orthorhombicity of these samples, no matter wheater it is Ca or Sr substitution.
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