Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmmr11a0912s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #MR11A-0912
Other
3919 Equations Of State, 3924 High-Pressure Behavior, 3954 X Ray, Neutron, And Electron Spectroscopy And Diffraction, 1015 Composition Of The Core
Scientific paper
We have measured the volume and lattice parameters of end-member Fe3P-schreibersite in the diamond anvil cell to pressures of 54 GPa at 300 K. Samples of Fe3P were also laser heated to temperatures of ~2100 K at 50 GPa, and examined following thermal quench. No pressure-induced or quenchable temperature-induced phase transitions are observed over the conditions of this study. Our pressure-volume data were fit to a 2nd-order Birch Murnaghan equation of state, yielding a best-fit isothermal bulk modulus, K0T, of 190 ± 5 with an assumed of 4; fit to a 3rd-order EOS yielded a K0T of 252 (± 15) GPa with a dK/dP of 1.0 (± 0.6). The wide stability range of the tetragonal Fe3P-structure and its ubiquity in iron-rich meteorites make schreibersite the most likely phase by which P was originally incorporated in deep planetary interiors. The moderately enhanced bulk modulus of this P-bearing alloy relative to pure iron could partially compensate for a bulk modulus depression induced by other possible lighter alloying components of planetary cores, such as sulfur.
Santillan J. D.
Scott Henry P.
Williams Quentin
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