Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmmr31b0373s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #MR31B-0373
Other
1015 Composition Of The Core, 3919 Equations Of State, 3924 High-Pressure Behavior, 6240 Meteorites And Tektites (1028, 3662)
Scientific paper
The density, elasticity and structural stability of iron and iron alloys are areas of long-standing interest in planetary science due to the known ubiquity of iron-rich cores in planetary bodies, and the observation that Earth's core is ~10% less dense than pure iron. Furthermore, iron-nickel meteorites often contain inclusions of iron carbide, sulfide and phosphide minerals, which has led to considerable interest in C, S and P (as well as many others) as potential "light" constituents of planetary cores. As part of our ongoing investigation of Fe3P, known as schreibersite when found in iron meteorites, we have measured the room-temperature bulk modulus (K0T) of Fe2P to 8 GPa using synchrotron X-ray diffraction coupled with Diamond Anvil Cells. Our motivation is to investigate systematics in the Fe-P system due to our previous observation that Fe3P is not stable above ~15 GPa (Scott et al., 2007). We used the same mixed-phase starting material (both Fe3P and Fe2P) as in our previous Fe3P Equation of State (EoS) study, but examined the bulk sample rather than a selection of pure Fe3P grains. Accordingly, our data contain information from both phases; we used diffraction peaks from Fe3P and its EoS to calibrate measurements on Fe2P relative to Fe3P. We imposed a constant \frac{c}{a} ratio on this hexagonal structure based on ambient-pressure measurements to reduce fitting parameters, which is consistent with observations of tetragonal Fe3P over this pressure range. A second order fit (i.e., dK/dP fixed at 4) to the Birch Murnaghan EoS produces a K0T of 140 ± 4 GPa. This value is 12% lower than that of Fe3P, and will be used to assess elasticity systematics in iron phosphide phases and potentially other AxY systems as well.
Boateng N.
Frank Michael R.
Meng Yanling
Scott Henry P.
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