Crystal structural features of hydrous forsterite : Effect of Fe on the M-site vacancies, possible hydrogen positions and variation of the unit cell dimensions
スポンサーリンク
概要
- 論文の詳細を見る
A qualitative understanding of the incorporation of hydrogen atoms in forsterite and corresponding octahedral vacancies are given from the inspection of the crystal structure with the view point of minimum strain configuration. In the case of Fe-free hydrous forsterite, the structural strain from the ideal size is larger in the M1 site than in the M2 site. Two H atoms may replace the Mg atom predominantly at the M1 site to reduce the structural strain, giving the vacancy at the M1 site. In the case of Fe-bearing hydrous forsterite, two H atoms may replace the Mg atom predominantly at the M2 site to avoid the combination of Fe in M1 site and Mg in M2 site for the reduction of the structural strain, giving the vacancy at the M2 site. In both cases, the most probable H atom locations are near to the edges of MO6 octahedra. Variation of the unit cell dimensions (∂b/b0 > ∂c/c0 > ∂a/a0) with the incorporation of hydrogen atom is interpreted in terms of retractable and unretractable chains in the part of olivine structure.
- 日本鉱物科学会の論文
- 2008-10-01
著者
-
Kudoh Yasuhiro
Institute Of Mineralogy Petrology And Economic Geology Faculty Of Science Tohoku University
-
Kudoh Yasuhiro
Institute Of Mineralogy Petrology And Economic Geology Graduate School Of Science Tohoku University
関連論文
- Pressure dependence of u parameter in ringwoodite up to 7.9GPa
- High-pressure single crystal X-ray diffraction and FT-IR observation of natural chondrodite and synthetic OH-chondrodite
- Cation vacancies and possible hydrogen atom positions in Fe-bearing hydrous forsterite, Mg_Fe_Si_H_O_4, synthesized at 13.5GPa and 1400℃
- Orientational ordering of three SiO_4 tetrahedra in α'_L-Ca_Sr_SiO_4 that satisfies bond-valence requirements and avoids O-O repulsion
- The partially dehydrated structure of natural heulandite : An in situ high temperature single crystal X-ray diffraction study
- Compressibility of phase A, Mg_7Si_2H_6O_ up to 11.2 GPa
- Effect of temperature and pressure on the crystal structure of topaz, Al_2Sio_4(OH,F)_2
- Stability of dense hydrous magnesium silicate phase G in the transition zone and the lower mantle
- Crystal structural features of hydrous forsterite : Effect of Fe on the M-site vacancies, possible hydrogen positions and variation of the unit cell dimensions
- Pressure dependence of u parameter in ringwoodite up to 7.9 GPa