Crystal structure, thermal expansivity, and elasticity of OH-chondrodite [electronic resource] : Trends among dense hydrous magnesium silicates
- Published
- Washington, D.C. : United States. National Nuclear Security Administration, 2015.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy - Physical Description
- 34 pages : digital, PDF file
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- United States. National Nuclear Security Administration and United States. Department of Energy. Office of Scientific and Technical Information
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- Free-to-read Unrestricted online access
- Summary
- Here, we report the structure and thermoelastic properties of OH-chondrodite. The sample was synthesized at 12 GPa and 1523 K, coexisting with hydroxyl-clinohumite and hydrous olivine. The Fe content Fe/(Fe+Mg) is 1.1 mol%, and the monoclinic unit-cell parameters are: a = 4.7459(2) Å, b = 10.3480(7) Å, c = 7.9002(6) Å, α = 108.702(7)°, and V = 367.50(4) Å3. At ambient conditions the crystal structure was refined in space group P21/b from 1915 unique reflection intensities measured by single-crystal x-ray diffraction. The volume thermal expansion coefficient was measured between 150 and 800 K, resulting in αV = 2.8(5)×10-9(K-2) × T + 40.9(7) × 10-6(K-1) – 0.81(3)(K)/T2, with an average value of 38.0(9)×10-6 K-1. Brillouin spectroscopy was used to measure a set of acoustic velocities from which all thirteen components (Cij) of the elastic tensor were determined. The Voigt-Reuss-Hill average of the moduli yield for the adiabatic bulk modulus, KS0 = 117.9(12) GPa, and for shear modulus, G0 = 70.1(5) GPa. The Reuss bound on the isothermal bulk modulus (KT0) is 114.2(14) GPa. From the measured thermodynamic properties, the Grüneisen parameter (γ) is calculated to be 1.66(4). Fitting previous static compression data using our independently measured bulk modulus (isothermal Reuss bound) as a fixed parameter, we refined the first pressure derivative of the bulk modulus, KT’ = 5.5(1). Systematic trends between H2O content and physical properties are evaluated among dense hydrous magnesium silicate (DHMS) phases along the forsterite-brucite join.
- Report Numbers
- E 1.99:1335501
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- Other Subject(s)
- Note
- Published through SciTech Connect.
04/01/2015.
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Contributions to Mineralogy and Petrology 169 4 ISSN 0010-7999 AM
Yu Ye; Steven D. Jacobsen; Zhu Mao; Thomas S. Duffy; Sarah M. Hirner; Joseph R. Smyth.
Carnegie Institution of Washington, Washington, D.C. (United States) - Funding Information
- NA0002006
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