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Crystal structure of hydrous wadsleyite with 2.8% H2O and compressibility to 60 GPa

  • Yu Ye , Joseph R. Smyth , Anwar Hushur , Murli H. Manghnani , Dayana Lonappan , Przemyslaw Dera and Daniel J. Frost
Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 95 Issue 11-12

Abstract

Hydrous wadsleyite (β-Mg2SiO4) with 2.8 wt% water content has been synthesized at 15 GPa and 1250 °C in a multi-anvil press. The unit-cell parameters are: a = 5.6686(8), b = 11.569(1), c = 8.2449(9) Å, β = 90.14(1)°, and V = 540.7(1) Å3, and the space group is I2/m. The structure was refined in space groups Imma and I2/m. The room-pressure structure differs from that of anhydrous wadsleyite principally in the increased cation distances around O1, the non-silicate oxygen. The compression of a single crystal of this wadsleyite was measured up to 61.3(7) GPa at room temperature in a diamond anvil cell with neon as pressure medium by X-ray diffraction at Sector 13 at the Advanced Photon Source, Argonne National Laboratory. The experimental pressure range was far beyond the wadsleyite-ringwoodite phase-transition pressure at 525 km depth (17.5 GPa), while a third-order Birch-Murnaghan equation of state (EoS) [V0 = 542.7(8) Å3, KT0 = 137(5) GPa, K′ = 4.6(3)] still fits the data well. In comparison, the second-order fit gives V0 = 542.7(8) Å3, KT = 147(2) GPa. The relation between isothermal bulk modulus of hydrous wadsleyite KT0 and water content CH2O is: KT0 = 171(1)-12(1) CH2O (up to 2.8 wt% water). The axial-compressibility βc is larger than both βa and βb, consistent with previous studies and analogous to the largest coefficient of thermal expansion along the c-axis.

Keywords: Compressibility; hydrous wadsleyite; neon; orthorhombic
Received: 2010-2-17
Accepted: 2010-7-2
Published Online: 2015-4-2
Published in Print: 2010-11-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2010.3533
Keywords for this article
Compressibility; hydrous wadsleyite; neon; orthorhombic

Articles in the same Issue

  1. Characterization of cation environments in polycrystalline forsterite by 25Mg MAS, MQMAS, and QCPMG NMR
  2. Structure of nanocrystalline phyllomanganates produced by freshwater fungi
  3. First-principles study on variation of lattice parameters of mullite Al4+2xSi2–2xO10–x (x = 0.125, 0.250, 0.375)
  4. Natrolite may not be a “soda-stone” anymore: Structural study of fully K-, Rb-, and Cs-exchanged natrolite
  5. Metal retention, mineralogy, and design considerations of a mature permeable reactive barrier (PRB) for acidic mine water drainage in Northumberland, U.K.
  6. A relationship between d104 value and composition in the calcite-disordered dolomite solid-solution series
  7. XRD, micro-XANES, EMPA, and SIMS investigation on phlogopite single crystals from Mt. Vulture (Italy)
  8. Volume behavior of the 10 Å phase at high pressures and temperatures, with implications for H2O content
  9. Interfacial tension between immiscible liquids in the system K2O-FeO-Fe2O3-Al2O3-SiO2 and implications for the kinetics of silicate melt unmixing
  10. H2O and the dehydroxylation of phyllosilicates: An infrared spectroscopic study
  11. Effects of intermediate range structure on the 29Si NMR chemical shifts of framework silicates: Results for analcime
  12. High-temperature Mössbauer spectroscopy: A probe for the relaxation time of Fe species in silicate melts and glasses
  13. The thermal equation of state of FeTiO3 ilmenite based on in situ X-ray diffraction at high pressures and temperatures
  14. OH species, U ions, and CO/CO2 in thermally annealed metamict zircon (ZrSiO4)
  15. Crystallographic and chemical constraints on the nature of the proustite–pyrargyrite solid-solution series
  16. Accurate μRaman characterization of reaction products at the surface of (bio)oxidized pyrite
  17. Determination of manganese valence states in (Mn3+, Mn4+) minerals by electron energy-loss spectroscopy
  18. AFM study of the epitaxial growth of brushite (CaHPO4·2H2O) on gypsum cleavage surfaces
  19. Compressibility of protoamphibole: A high-pressure single-crystal diffraction study of protomangano-ferro-anthophyllite
  20. Crystal structure of hydrous wadsleyite with 2.8% H2O and compressibility to 60 GPa
  21. Dehydration and rehydration processes in gmelinite: An in situ X-ray single-crystal study
  22. Characteristics of emission centers in alkali feldspar: A new approach by using cathodoluminescence spectral deconvolution
  23. Mechanism of metamorphic zircon growth in a granulite-facies quartzite, Adirondack Highlands, Grenville Province, New York
  24. Speciation and mixing behavior of silica-saturated aqueous fluid at high temperature and pressure
  25. A critical comment on Thy et al. (2009b): Liquidus temperatures of the Skaergaard magma
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