Structure and cation disorder of hydrous ringwoodite, γ-Mg1.89Si0.98H0.30O4

被引：59

作者：

Kudoh, Y ^{[1
]}

Kuribayashi, T ^{[1
]}

Mizobata, H ^{[1
]}

Ohtani, E ^{[1
]}

机构：

[1] Tohoku Univ, Fac Sci, Inst Mineral Petrol & Econ Geol, Sendai, Miyagi 9808578, Japan

来源：

PHYSICS AND CHEMISTRY OF MINERALS | 2000年 / 27卷 / 07期

关键词：

hydrous ringwoodite; Mg-Si disorder; IR spectrum; Raman spectrum;

D O I：

10.1007/s002690000091

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The structure of a single crystal hydrous ring-woodite. Mg1.89Si0.98H0.30O4 synthesized at conditions of 1300 degrees C and 20 GPa has been analyzed. Crystallographic data for hydrous ringwoodite obtained are; Cubic with Space group: Fd3m (no. 227). a = 8.0693(5) Angstrom, V = 526.41(9) Angstrom(3), Z = 8, 3.48 g cm(-3). The results of site occupancy refinement using higher angle reflections showed the existence of a small degree of Mg2+-Si4+ disorder in the structure such as (Mg(1.84)Si(0.05)rectangle(0.11))(Si(0.93)Mg(0.05)rectangle(0.02))H0.30O4 The IR and Raman spectra were measured and OH vibration spectra were observed. A broad absorption band was observed in the IR spectrum and the maxima were observed at 3160 cm(-1) in the IR and at 3165 cm(-1) and 3685 cm(-1) in relatively sharp Raman spectra, which suggest that locations between O-O pairs around the octahedral 16c and 16d sites are possible sires for hydrogen.

引用

页码：474 / 479

页数：6

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