TY - JOUR
T1 - P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus
AU - Zhai, Shuangmeng
AU - Yamazaki, Daisuke
AU - Xue, Weihong
AU - Ye, Lijin
AU - Xu, Chaowen
AU - Shan, Shuangming
AU - Ito, Eiji
AU - Yoneda, Akira
AU - Yoshino, Takashi
AU - Guo, Xinzhuan
AU - Shimojuku, Akira
AU - Tsujino, Noriyoshi
AU - Funakoshi, Ken Ichi
N1 - Funding Information:
The synchrotron radiation experiments were carried out at the BL04B1 beam-line, SPring-8, Japan (Proposal Nos. 2011A1072 and 2012A1139). The authors thank J. Kung, R. Miletich, and an anonymous reviewer for their helpful comments and suggestions. This work was financially supported by the NSFC (Grant Nos. 40973045 and 41202020) and partially supported by the Visiting Researcher’s Program of the Institute for Study of the Earth’s Interior, Okayama University.
PY - 2012/10
Y1 - 2012/10
N2 - Tuite, γ-Ca3(PO4)2, is regarded as an important phosphate mineral in the deep mantle playing a crucial role as a host for rare earth elements, large ion lithophile elements, and phosphorus. In this study we report the thermoelastic properties of synthetic γ-Ca 3(PO4)2 at simultaneously high pressures and temperatures of up to 35.4 GPa and 1300 K, respectively, as determined by means of in situ energy-dispersive X-ray diffraction in a large-volume multi-anvil apparatus. The pressure-volume-temperature data obtained for γ-Ca 3(PO4)2 were fitted by the high-temperature Birch-Murnaghan equation of state to yield V0 = 447.4(4) Å3, KT0 = 100.8(18) GPa, K′T0 = 5.74(13), (∂KT/∂T)P = -0.020(1) GPa/K, and αT = 3.26(18) × 10-5 + 1.76(24) × 10-8 T. In addition, fitting the present data to the Mie-Grüneisen-Debye equation of state gives γ0 = 1.35(6), θ0 = 944(136) K, and q = 0.37(29). Based on the thermoelastic properties obtained in our study, the density profiles of γ-Ca 3(PO4)2 tuite along typical cold and hot slab geotherms were calculated and are compared with those of the coexisting silicate minerals in subducting mid-ocean ridge basalt.
AB - Tuite, γ-Ca3(PO4)2, is regarded as an important phosphate mineral in the deep mantle playing a crucial role as a host for rare earth elements, large ion lithophile elements, and phosphorus. In this study we report the thermoelastic properties of synthetic γ-Ca 3(PO4)2 at simultaneously high pressures and temperatures of up to 35.4 GPa and 1300 K, respectively, as determined by means of in situ energy-dispersive X-ray diffraction in a large-volume multi-anvil apparatus. The pressure-volume-temperature data obtained for γ-Ca 3(PO4)2 were fitted by the high-temperature Birch-Murnaghan equation of state to yield V0 = 447.4(4) Å3, KT0 = 100.8(18) GPa, K′T0 = 5.74(13), (∂KT/∂T)P = -0.020(1) GPa/K, and αT = 3.26(18) × 10-5 + 1.76(24) × 10-8 T. In addition, fitting the present data to the Mie-Grüneisen-Debye equation of state gives γ0 = 1.35(6), θ0 = 944(136) K, and q = 0.37(29). Based on the thermoelastic properties obtained in our study, the density profiles of γ-Ca 3(PO4)2 tuite along typical cold and hot slab geotherms were calculated and are compared with those of the coexisting silicate minerals in subducting mid-ocean ridge basalt.
KW - In situ X-ray diffraction
KW - Thermal equation of state
KW - Thermoelastic properties
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U2 - 10.2138/am.2013.4403
DO - 10.2138/am.2013.4403
M3 - Article
AN - SCOPUS:84885038047
SN - 0003-004X
VL - 98
SP - 1811
EP - 1816
JO - American Mineralogist
JF - American Mineralogist
IS - 10
ER -