2 research outputs found
Rare-Earth(RE)–Barium Solubility Behaviour in Y(Ba<SUB>2−x</SUB>RE<SUB>x</SUB>)Cu<SUB>3</SUB>O<SUB>7+δ</SUB> and Sm(Ba<SUB>2−x</SUB>RE<SUB>x</SUB>)Cu<SUB>3</SUB>O<SUB>7+δ</SUB>
No full textThe lattice constants and the superconducting transition temperatures of the series Y(Ba2−xREx)Cu3O7+δ(RE=Pr, Eu, and Gd; x≦0.4) show that the solubility of RE with Ba is practically absent for Eu and Gd, whereas a small solubility of Pr cannot be ruled out. The degree of RE-Ba solubility limit in the Y-based systems is significantly smaller relative to that in the respective RE based series. This observation could be consistently understood by our earlier proposal on the RE-Ba solubility dependence on the degree of O-O repulsive interaction. Our results also indicate that Pr is trivalent in these oxides, contrary to a previous report
Absence of solid solution of the type, Y(Ba<SUB>2−x</SUB>RE<SUB>x</SUB>)Cu<SUB>3</SUB>O<SUB>7±δ</SUB> and its possible implications
No full textThe results of X-ray diffraction and resistivity measurements of the specimens Y(Ba2−xREx)Cu3O7±δ (RE=Ce, Pr, Eu and Gd; x\lesssim0.4) are presented. The results suggest that the RE ions are not soluble with Ba in this series. This indicates that RE-Ba ionic size differences alone cannot explain the solubility behaviour normally observed in REBa2Cu3O7±δ compounds. We propose that O-O repulsive interaction plays a major role in deciding the solubility limits
