Syntheses and Characterization of LnBa<sub>2</sub>Cu<sub>2</sub>MO<sub><i>y</i></sub> (Ln=La, Pr and M=Ta, Nb)

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  • ICHINOSE Ataru
    Superconductivity Research Laboratory, International Superconductivity Technology Center Yokosuka Research Laboratory, Central Research Institute of Electric Power Industry
  • WADA Takahiro
    Superconductivity Research Laboratory, International Superconductivity Technology Center Central Research Laboratory, Matsushita Electric Industry Co. Ltd.
  • YAMAUCHI Hisao
    Superconductivity Research Laboratory, International Superconductivity Technology Center Faculty of Engineering, The University of Windsor
  • TANAKA Shoji
    Superconductivity Research Laboratory, International Superconductivity Technology Center

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  • LnBa<sub>2</sub>Cu<sub>2</sub>MO<sub><i>y</i></sub> (Ln=La, Pr: M=Ta, Nb) の合成とその結晶構造
  • LnBa2Cu2MOy Ln La Pr M Ta Nb ノ ゴウセイ ト ソ

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Abstract

Four non-superconducting oxides, i.e. LaBa2Cu2TaO8, LaBa2Cu2NbO8, PrBa2Cu2TaO8 and PrBa2Cu2NbO8, were synthesized. Their crystallographic structures were determined by means of the Rietveld analysis using X-ray powder diffraction data. In these compounds, Ta and Nb ions were found to preferentially occupy the Cu 1 site between the two Ba layers in the LaBa2Cu3O7-type structure. The absence of superconductivity in these materials was discussed in terms of the bond valence sum of each cation in the crystal and a possibility to exhibit superconductivity by modifying these materials was suggested.

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