菱沸石の結晶構造精密化―水分子と交換性陽イオンの結晶学的配置―

  • 中塚 晃彦
    山口大学大学院理工学研究科物質工学系学域先端材料工学分野

書誌事項

タイトル別名
  • Structure Refinement of a Hydrated Chabazite-Crystallographic Configurations of Water Molecules and Exchangeable Cations-
  • リョウフッセキ ノ ケッショウ コウゾウ セイミツカ ミズ ブンシ ト コウカンセイ ヨウイオン ノ ケッショウガクテキ ハイチ
  • —Crystallographic Configurations of Water Molecules and Exchangeable Cations—
  • ―水分子と交換性陽イオンの結晶学的配置―

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抄録

Locations of water molecules and exchangeable cations in a hydrated natural chabazite with a composition of Ca1.57Na0.49 [Al3.39Si8.55O24] ⋅12.47H [d2] O were successfully determined by single crystal X-ray diffraction. The structure analyses have revealed the presences of five partially occupied water sites (OW1-OW5) and four partially occupied exchangeable-cation sites (Ca1-Ca4), and have showed that fully coordinated exchangeable cations can adopt sixfold or sevenfold coordination. The distances between water sites and framework oxygen sites and between water sites suggest that the hydrogen bonds formed between water molecules and framework oxygen atoms are very weak, whereas strong hydrogen bonds exist between water molecules.

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