The structural studies of CaMgSi2O6, CaCoSi2O6 and CaNiSi2O6 glasses.

• TANIGUCHI Taketoshi

  Department of Earth Sciences, Faculty of Science, Kanazawa University

• OKUNO Masayuki

  Department of Earth Sciences, Faculty of Science, Kanazawa University

• MATSUMOTO Takeo

  Department of Earth Sciences, Faculty of Science, Kanazawa University

抄録

Local structures around Si, Ca, Mg, Co, and Ni atoms in CaMgSi₂O₆, CaCoSi₂O₆, and CaNiSi₂O₆ glasses were investigated by X-ray diffraction, XAFS, and optical absorption spectra measurements. Si–O interatomic distances of these three glasses are 1.62 Å and coordination numbers of Si atoms are 4. Mg–O, Co–O, and Ni–O interatomic distances are in the range of 2.00 to 2.06 Å and coordination numbers of Co and Ni atoms are estimated to be 4 in the corresponding glass. Ca–O distances are in the range of 2.44 to 2.51 Å and coordination numbers of Ca atoms are estimated to be 6 in the three glasses. Similarities of radial distribution functions obtained from X-ray scattering intensities and XAFS spectra indicate that these glasses have a similar structure and similar local configurations of each cation. The coordination numbers of Ca, Co, and Ni atoms and the interatomic distances of Mg–O, Co–O, and Ni–O in the glasses are smaller than those in the corresponding crystals. These results show that interstitial space of SiO₄ networks of these glasses is too large for these modifier atoms, and these atoms are located on the place apart from the center of space. The result of optical absorption spectra measurements reveals that the difference of the ligand field stabilization energy of Ni atom between CaNiSi₂O₆ glass and crystal is larger than that of Co atom between CaCoSi₂O₆ glass and crystal. This result is related to the difference of the heat of vitrification from these crystals and the different partition of modifier atom into these crystals.

収録刊行物

• Ｍｉｎｅｒａｌｏｇｉｃａｌ　Ｊｏｕｒｎａｌ

  Ｍｉｎｅｒａｌｏｇｉｃａｌ　Ｊｏｕｒｎａｌ 17 (5), 231-244, 1995

  一般社団法人　日本鉱物科学会

キーワード

• General Earth and Planetary Sciences
• General Environmental Science

詳細情報

• CRID: 1390001206544794368
• NII論文ID: 10008771149
• NII書誌ID: AA00739590
• DOI: 10.2465/minerj.17.231
• ISSN: 18814174
• ISSN: 05442540
• 本文言語コード: en
• データソース種別:
  • JaLC
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  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可