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Compression of single-crystal magnesium oxide to 118 GPa and a ruby pressure gauge for helium pressure media
-
Steven D. Jacobsen
,
Christopher M. Holl
Published/Copyright:
April 1, 2015
Abstract
The pressure-volume equation of state (EoS) of single-crystal MgO has been studied in diamondanvil cells loaded with helium to 118 GPa and in a non-hydrostatic KCl pressure medium to 87 GPa using monochromatic synchrotron X-ray diffraction. A third-order Birch-Murnaghan fit to the nonhydrostatic P-V data (KCl medium) yields typical results for the initial volume, V0 = 74.698(7) Å3, bulk modulus, KT0 = 164(1) GPa, and pressure derivative, K′ = 4.05(4), using the non-hydrostatic ruby pressure gauge of Mao et al. (1978). However, compression of MgO in helium yields V0 = 74.697(6) Å3, KT0 = 159.6(6) GPa, and K′ = 3.74(3) using the quasi-hydrostatic ruby gauge of Mao et al. (1986). In helium, the fitted equation of state of MgO underdetermines the pressure by 8% at 100 GPa when compared with the primary MgO pressure scale of Zha et al. (2000), with KT0 = 160.2 GPa and K′ = 4.03. The results suggest that either the compression mechanism of MgO changes above 40 GPa (in helium), or the ruby pressure gauge requires adjustment for the softer helium pressure medium. We propose a ruby pressure gauge for helium based on shift of the ruby-R1 fluorescence line (Δλ/λ0) and the primary MgO pressure scale, with P (GPa) = A/B{[1 + (Δλ/λ0)]B - 1}, where A is fixed to 1904 GPa and B = 10.32(7).
Received: 2008-3-26
Accepted: 2008-5-15
Published Online: 2015-4-1
Published in Print: 2008-11-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
MgO;
helium pressure medium;
static compression;
equation of state;
ruby fluorescence
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- Amorphous materials: Properties, structure, and durability: Constrained interactions, rigidity, adaptative networks, and their role for the description of silicates
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