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

Y. Kudoh, T. Kuribayashi, H. Mizobata, E. Ohtani

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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.

Original languageEnglish
Pages (from-to)474-479
Number of pages6
JournalPhysics and Chemistry of Minerals
Issue number7
Publication statusPublished - 2000


  • Hydrous ringwoodite
  • IR spectrum
  • Mg-Si disorder
  • Raman spectrum


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