Abstract
Delafossite-type oxides of CuTb y Y 1− y O 2 , CuEu y Y 1− y O 2 , CuCa x Tb y Y 1− x − y O 2 and CuCa x Eu y Y 1− x − y O 2 have been prepared by solid state reactions. The lattice-parameter dependence on the composition implies substitution of the Tb 3+ , Eu 3+ and Ca 2+ cations for the Y 3+ site. Noticeable sharp emission lines due to the f–f transitions ( 5 D 4 → 7 F J , J =3–6) of Tb 3+ or due to the f–f transitions ( 5 D 0 → 7 F J , J =0–4) of Eu 3+ are observed at room temperature. Electrical conductivities of CuCa x Tb y Y 1− x − y O 2 and CuCa x Eu y Y 1− x − y O 2 are larger than those of CuTb y Y 1− y O 2 and CuEu y Y 1− y O 2 , indicating the increase of the hole concentration caused by the substitution of Ca 2+ for the Y 3+ site. These results indicate the controllability of the luminescence and conductivity in CuCa x Tb y Y 1− x − y O 2 and CuCa x Eu y Y 1− x − y O 2 delafossite-type oxides by simultaneous substitution of the rare earth Tb 3+ or Eu 3+ cation and the Ca 2+ cation for the Y 3+ site.
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