Static pressure of 255 GPa (2.55 Mbar) by X-ray diffraction: comparison with extrapolation of the ruby pressure scale

X-ray diffraction studies have been carried out to 255 GPa on various sample and gasket configurations in the diamond-anvil cell. Intense fluorescence emission bands were observed at 793 and 830 nm in some cases which correspond to 360 and 550 GPa on the extrapolated ruby pressure scale. The X-ray m...

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Bibliographic Details
Published in:Physical review letters 1988-08, Vol.61 (5), p.574-577
Main Authors: VOHRA, Y. K, DUCLOS, S. J, BRISTER, K. E, RUOFF, A. L
Format: Article
Language:English
Subjects:
Exact sciences and technology
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Physics
X- and γ-ray instruments and techniques
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Summary:X-ray diffraction studies have been carried out to 255 GPa on various sample and gasket configurations in the diamond-anvil cell. Intense fluorescence emission bands were observed at 793 and 830 nm in some cases which correspond to 360 and 550 GPa on the extrapolated ruby pressure scale. The X-ray measured pressures were only 185 and 201 GPa, respectively. Reasons for this discrepancy between X-ray methods and optical methods at ultrahigh pressures are proposed. (Author)
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.61.574