Abstract
By replacing Y with several kinds of rare-earth elements ( RE’s), new members of high-temperature superconductor related cuprates, (Pb, Cu)Sr 2( RE, Ca)Cu 2O z ( z ≈ 7, RE: Sm, Eu and Gd), are successfully prepared in a single-phase form. Chemical formula of these compounds proves to be (Pb (1+ x )/2Cu (1− x )/2)Sr 2( RE 1− x Ca x )Cu 2O z , which is completely same as that of (Pb, Cu)Sr 2(Y, Ca)Cu 2O z . Single phase samples are obtained for x = 0–0.5 in the cases of RE = Sm and Eu while in the case of RE = Gd, those are obtained for x values up to ∼0.4. Solubility of Ca in the RE site varies in accordance with RE species and seems to strongly depend on its ionic radius, i.e., large RE 3+ results in large solubility. In addition, formation process of the present compounds is discussed based on the results of X-ray diffractometry, differential thermal analysis and scanning electron microscopy.
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