Peculiar Five-fold Coordinated Sites Observed in the Oxides with Derivative Structure.

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  • 誘導構造をとる酸化物にみられる特異な５配位陽イオン席
  • ユウドウ コウゾウ オ トル サンカブツ ニ ミラレル トクイ ナ 5ハイイ ヨウイオンセキ

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Abstract

In the oxides with derivative structure of perovskite, peculier five-fold coordinated sites occur at the boundary regions between the fundamental structure units. The five-fold coordinated trigonal bipyramidal sites with large distortion have the much longer mean bond distances than those expected from the effective ionic radius and the distances are similar to those of octahedral site. The bond valence calculation for those sites yields significant lower-valences than the expected values due to the longer bond distances.

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