In-situ angle-dispersive x-ray diffraction measurements on three samples of Gr(14)An(84), Gr(34)An(64) and Gr(63)An(34) were performed by using a diamond anvil cell instrument with synchrotron radiation at the Beijing Synchrotron Radiation Facility at up to 13.7 GPa. A least-square fit of the pressure-volume to the Birch-Murnaghan equation of state, when fixed K(0)' = 4.0 yields bulk modulus values of K(0) = 166 +/- 2, 168 +/- 3, 173 +/- 2GPa for Gr(14)An(84), Gr(34)An(64) and Gr(63)An(34), respectively. The bulk modulus increases from 166 +/- 2GPa for Gr(14)An(84) and to 173 +/- 2GPa for Gr(63)An(34) with the increasing An content. Furthermore, by linear interpolation, the bulk modulus of the Gr-An binary system as a function of An content can be expressed as K(0)(GPa) = 176.9(9)-0.12(1)X(An) (R(2) = 0.987).

Publication name	CHINESE PHYSICS LETTERS　Volume:28 　Issue:7 　　Article Number:076101　 Published:JUL 2011
Author(s)	Fan Da-Wei; Wei Shu-Yi; Liu Jing; Li Yan-Chun; Xie Hong-Sen
Corresponding author	FAN Dawei  fandawei@mails.gyig.ac.cn  Chinese Acad Sci, Inst Geochem, Lab Study Earths Interior & Geofluids, Guiyang 550002, Peoples R China

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