Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3406302s&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 6, CiteID L06302
Physics
7
Geochemistry: Composition Of The Core, Mineralogy And Petrology: Planetary Mineralogy And Petrology (5410), Mineral Physics: Equations Of State, Mineral Physics: High-Pressure Behavior, Mineral Physics: X-Ray, Neutron, And Electron Spectroscopy And Diffraction
Scientific paper
We have collected in situ X-ray diffraction patterns of end-member Fe3P-schreibersite in a diamond anvil cell to pressures of 30 GPa at 300 K. Some samples of Fe3P were also laser heated at high pressure to temperatures of ~2000 K and examined following thermal quench. Below 8 GPa, variation of the schreibersite unit cell delineates a smooth pressure-volume curve corresponding to a second order Birch-Murnaghan equation of state with bulk modulus, K0T , of 159(1) GPa. Above 8 GPa, however, the schreibersite structure shows substantial stiffening, and an unidentified structure develops between 17 and 30 GPa; upon decompression to ambient pressure the schreibersite structure returns. Therefore, although ubiquitous in iron-rich meteorites, it is unlikely that schreibersite is the stable phosphorus-bearing phase in deep planetary cores.
Frank Mark R.
Huggins Sabrina
Maglio Steven J.
Martin Donn Christopher
Meng Yue
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