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Single-crystal x-ray diffraction of brucite to 14 GPa

✍ Scribed by Thomas S. Duffy; Jinfu Shu; Ho-kwang Mao; Russell J. Hemley

Publisher
Springer-Verlag
Year
1995
Tongue
English
Weight
448 KB
Volume
22
Category
Article
ISSN
0342-1791

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✦ Synopsis

Single-crystal brucite, Mg(OH)2, was studied to 14 GPa in a quasi-hydrostatic pressure medium using a diamond anvil cell and energy-dispersive synchrotron xray diffraction. The parameters of a third-order Birch-Murnaghan equation of state fit to the data are:

KoT---42(2) GPa, and (~K07/0P)T= 5.7(5). The bulk modulus is significantly lower than that obtained in recent shock compression and powder x-ray diffraction experiments under non-hydrostatic conditions. No evidence was found for a transition involving the Mg-O substructure over the pressure range of these experiments. This implies that the structural change previously identified at high pressure by Raman spectroscopy probably involves rearrangement of hydrogen atoms, leaving the Mg-O substructure largely unaffected.

πŸ“œ SIMILAR VOLUMES

Single crystal X-ray diffraction on iodi
Single crystal X-ray diffraction on iodine up to 5.7 GPa
✍ H. d'Amour-Sturm; W.B. Holzapfel πŸ“‚ Article πŸ“… 1986 πŸ› Elsevier Science βš– 121 KB

The structure of iodine is studied by single crystal X-ray diffraction up to 5.7 GPa. The present data confirm the conclusions that have been deduced from earlier high pressure powder X-ray diffraction experiments, i.e. that the intramolecular distance remains almost constant up to the phase transit