Abstract
It is concluded from detailed investigations on rare-earth-substituted 1113-system CaBaLa 1- x R x Cu 3O 7- δ (R= Pr, Nd, Sm, Eu, Gd, Er, Ho, Dy, Yb and Tm) that only R=Pr and Nd have a complete range of solid solubility (0⩽ x⩽1.0). Among other rare-earth ions, only Sm( x⩽0.8) and Eu( x⩽0.6) have a large enough range of solid solubility, while the remaining undergo severe phase separation resulting in the formation of multiphase mixtures even for low values of x. The T c-values of CaBaLa 1- x R x Cu 3O 7- δ (R=Nd, Sm and Eu) show a decreasing trend with increase in x. In these respects, the influence of substitution of rare-earth ions in the CaBaLaCu 3O 7- δ system is quite different from that in YBa 2Cu 3O 7- δ , except that both CaBaPrCu 3O 7- δ and PrBa 2Cu 3O 7- δ are semiconducting.
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