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

Y. Kudoh; Takahiro Kuribayashi; H. Mizobata; Eiji Otani

doi:10.1007/s002690000091

Structure and cation disorder of hydrous ringwoodite, γ-Mg_1.89Si_0.98H_0.30O₄

Y. Kudoh, Takahiro Kuribayashi, H. Mizobata, Eiji Otani

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

71 Citations (Scopus)

Abstract

The structure of a single crystal hydrous ringwoodite, Mg_1.89Si_0.98H_0.30O₄ synthesized at conditions of 1300 °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) Å, V = 526.41(9) Å³, Z = 8, D(calc) = 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_1.84Si_0.05[]_0.11)(Si_0.93Mg_0.05[]_0.02)H_0.30O₄. 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 sites for hydrogen.

Original language	English
Pages (from-to)	474-479
Number of pages	6
Journal	Physics and Chemistry of Minerals
Volume	27
Issue number	7
DOIs	https://doi.org/10.1007/s002690000091
Publication status	Published - 2000 Jan 1

Keywords

Hydrous ringwoodite
IR spectrum
Mg-Si disorder
Raman spectrum

ASJC Scopus subject areas

Materials Science(all)
Geochemistry and Petrology

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10.1007/s002690000091

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@article{6882354b41684b009ae0c9993e45310a,

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

abstract = "The structure of a single crystal hydrous ringwoodite, Mg1.89Si0.98H0.30O4 synthesized at conditions of 1300 °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) {\AA}, V = 526.41(9) {\AA}3, Z = 8, D(calc) = 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 (Mg1.84Si0.05[]0.11)(Si0.93Mg0.05[]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 sites for hydrogen.",

keywords = "Hydrous ringwoodite, IR spectrum, Mg-Si disorder, Raman spectrum",

author = "Y. Kudoh and Takahiro Kuribayashi and H. Mizobata and Eiji Otani",

year = "2000",

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T1 - Structure and cation disorder of hydrous ringwoodite, γ-Mg1.89Si0.98H0.30O4

AU - Kudoh, Y.

AU - Kuribayashi, Takahiro

AU - Mizobata, H.

AU - Otani, Eiji

PY - 2000/1/1

Y1 - 2000/1/1

N2 - The structure of a single crystal hydrous ringwoodite, Mg1.89Si0.98H0.30O4 synthesized at conditions of 1300 °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) Å, V = 526.41(9) Å3, Z = 8, D(calc) = 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 (Mg1.84Si0.05[]0.11)(Si0.93Mg0.05[]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 sites for hydrogen.

AB - The structure of a single crystal hydrous ringwoodite, Mg1.89Si0.98H0.30O4 synthesized at conditions of 1300 °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) Å, V = 526.41(9) Å3, Z = 8, D(calc) = 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 (Mg1.84Si0.05[]0.11)(Si0.93Mg0.05[]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 sites for hydrogen.

KW - Hydrous ringwoodite

KW - IR spectrum

KW - Mg-Si disorder

KW - Raman spectrum

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