X-ray diffraction study of Be to megabar pressure

Powder x-ray diffraction experiments on a low-Z element, Be, were performed at pressures up to 171 GPa using the synchrotron radiation source at SPring-8 (Super Photon ring 8 GeV). All profiles were assigned to the hcp structure of the ambient phase, and the theoretically predicted hcp-bcc phase tra...

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Bibliographic Details
Published inJournal of physics. Condensed matter Vol. 14; no. 44; pp. 10569 - 10573
Main Authors Nakano, Kazutaka, Akahama, Yuichi, Kawamura, Haruki
Format Journal Article Conference Proceeding
LanguageEnglish
Published Bristol IOP Publishing 11.11.2002
Institute of Physics
Subjects
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Elemental solids
Exact sciences and technology
Metals. Metallurgy
Physics
Structure of solids and liquids; crystallography
Structure of specific crystalline solids
Compressibility
Pressure effects
Equations of state
Beryllium
XRD
Experimental study
Lattice parameters
Synchrotron radiation
Very high pressure
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Summary:Powder x-ray diffraction experiments on a low-Z element, Be, were performed at pressures up to 171 GPa using the synchrotron radiation source at SPring-8 (Super Photon ring 8 GeV). All profiles were assigned to the hcp structure of the ambient phase, and the theoretically predicted hcp-bcc phase transition was not observed. The previously proposed hcp-hexagonal phase transition around 14.5 GPa was also not confirmed. The equation of state of hcp-Be was determined by a least mean squares fitting to the Birch-Muraaghan equation from these diffraction data. Calculated values of K sub 0 and K' sub 0 were 97.2 plus/minus 2.5 GPa and 3.61 plus/minus 0.07, respectively.
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ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/14/44/334