Extending the single-crystal quartz pressure gauge up to hydrostatic pressure of 19GPa

In situ high-pressure diffraction experiments on single-crystal [alpha]-quartz under quasi-hydrostatic conditions up to 19GPa were performed with diamond-anvil cells. Isotropic pressures were calibrated through the ruby-luminescence technique. A 4:1 methanol-ethanol mixture and the densified noble g...

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Bibliographic Details
Published in:Journal of applied crystallography 2016-12, Vol.49 (6), p.2129-2137
Main Authors: Scheidl, Katharina S, Kurnosov, Alexander, Trots, Dmytro M, Boffa Ballaran, Tiziana, Angel, Ross J, Miletich, Ronald
Format: Article
Language:English
Subjects:
Anisotropy
Compressibility
Crystallography
Diamonds
Diffraction
Media
Parameter estimation
Parameters
Quartz
Single crystals
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Summary:In situ high-pressure diffraction experiments on single-crystal [alpha]-quartz under quasi-hydrostatic conditions up to 19GPa were performed with diamond-anvil cells. Isotropic pressures were calibrated through the ruby-luminescence technique. A 4:1 methanol-ethanol mixture and the densified noble gases helium and neon were used as pressure media. The compression data revealed no significant influence of the pressure medium at room temperature on the high-pressure behavior of [alpha]-quartz. In order to describe its compressibility for use as a pressure standard, a fourth-order Birch-Murnaghan equation of state (EoS) with parameters KT0=37.0(3)GPa, KT0'=6.7(2) and KT0''= -0.73(8)GPa-1 was applied to fit the data set of 99 individual data points. The fit of the axial compressibilities yields MT0=104.5(8)GPa, MT0'=13.7(4), MT0''=-1.04(11)GPa-1 (a axis) and MT0=141(3)GPa, MT0'= 21(2), MT0''= 8.4(6)GPa-1 (c axis), confirming the previously reported anisotropy. Assuming an estimated standard deviation of 0.0001% in the quartz volume, an uncertainty of 0.013GPa can be expected using the new set of EoS parameters to determine the pressure.
ISSN:0021-8898
1600-5767
1600-5767
DOI:10.1107/S1600576716015351