Chinese Physics C > 2012, Vol. 36 > Issue(2): 179-183 DOI: 10.1088/1674-1137/36/2/014

Synchrotron X-ray diffraction study of phenacite at high pressure

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Abstract：
We report the results of a natural phenacite from 0 to 30.9 GPa using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the National Synchrotron Light Source, Brookhaven National Laboratory. Over this pressure range, no phase change or disproportionation has been observed. The isothermal equation of state was determined. The values of V ₀, K ₀, and K ₀′ refined with a third-order Birch-Murnaghan equation of state are V ₀=1116.1±1.2 Å ³, K ₀=223±9 GPa, and K ₀′=5.5±0.8. Furthermore, we confirm that the linear compressibilities ( β) along aand cdirections of phenacite are elastically isotropic ( β _a=1.50×10 ^-3and β _c=1.34×10 ^-3GPa ^-1). Consequently, it can be concluded that the compressibility of phenacite under high pressures has been accurately constrained.

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Bragg L, Claringbull G F. Crystal Structure of Minerals.Bell, London, 19652 Zachariasen W H. Soviet Physics Crystallography, 1972,16: 10213 Downs J W. PhD Thesis. Virginia Polytechnic Institutcand State University, Blacksburg, Virginia, 19834 Hazen R M, Au A Y. Physics and Chemistry of Minerals,1986, 13: 695 Yeganeh-Haeri A, Weidner D J. Physics and Chemistry ofMinerals, 1989, 16: 3606 Hazen R M, Finger L W. Physics and Chemistry of Miner-als, 1987, 14: 4267 Gatta G D, Nestola F, Ballaran T B. Physics and Chem-istry of Minerals, 2006, 33: 2358 MAO H K, XU J, Bell P M. Journal of Geophysical Re-search, 1986, 91: 46739 Hammersley J. Fit2d User Manual. ESRF, Grenoble,France, 199610 Holland T J, Tedfern S A. Mineralogical Magazine, 1997,61: 6511 Angel R J. Reviews in Mineralogy and Geochemistry, 2001,41: 3512 Hofmeister A M. Geophysical Research Letters, 1993, 20:635

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FAN Da-Wei, MA Mai-Ning, WEI Shu-Yi, CHEN Zhi-Qiang and XIE Hong-Sen. Synchrotron X-ray diffraction study of phenacite at high pressure[J]. Chinese Physics C, 2012, 36(2): 179-183. doi: 10.1088/1674-1137/36/2/014

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Received: 2011-04-26
Revised: 2011-06-08

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Synchrotron X-ray diffraction study of phenacite at high pressure

Corresponding author:FAN Da-Wei,

Corresponding author:MA Mai-Ning,

Received Date:2011-04-26
Accepted Date:2011-06-08
Available Online:2012-02-05

Abstract:We report the results of a natural phenacite from 0 to 30.9 GPa using in situ angle-dispersive X-ray diffraction and a diamond anvil cell at the National Synchrotron Light Source, Brookhaven National Laboratory. Over this pressure range, no phase change or disproportionation has been observed. The isothermal equation of state was determined. The values ofV₀,K₀, andK₀′ refined with a third-order Birch-Murnaghan equation of state areV₀=1116.1±1.2 Å³,K₀=223±9 GPa, andK₀′=5.5±0.8. Furthermore, we confirm that the linear compressibilities (β) alongaandcdirections of phenacite are elastically isotropic (β_a=1.50×10^-3andβ_c=1.34×10^-3GPa^-1). Consequently, it can be concluded that the compressibility of phenacite under high pressures has been accurately constrained.