R4: 地球表層・環境・生命

[R4-07] 中性子回折とラマン分光によるNesquehoniteの化学式の再検討

「発表賞エントリー」

*山本 弦一郎¹、興野 純¹、阿部 淳²、佐野 亜沙美³、服部 高典³ (1. 筑波大学、2. 総合科学研究機構、3. 日本原子力研究開発機構)

キーワード：ネスケホン石、中性子回折、ラマン分光、水素結合

Neutron diffraction and Raman spectroscopy were performed to determine the structure and chemical formula of nesquehonite. The difference between our study and Hales et al. (2008) strongly indicates that nesquehonite can have two chemical formulas, Mg(OH)(HCO₃)・2H₂O and MgCO₃・3H₂O depending on the pH in the solution. That is, nesquehonite grown in a solution with pH around neutrality would have the chemical formula of Mg(OH)(HCO₃)・2H₂O, but that in a strongly alkaline solution results in the chemical formula of MgCO₃・3H₂O.