Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmmr53b0984h&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #MR53B-0984
Other
3909 Elasticity And Anelasticity, 3919 Equations Of State, 3924 High-Pressure Behavior
Scientific paper
We have measured the room temperature lattice parameters and unit cell volume of Fe3P-schreibersite to 8 GPa in a hydrostatic pressure medium. The presence of Fe3P in iron-rich meteorites makes schreibersite the most likely phase by which P was originally incorporated in planetary interiors. We made in situ diffraction measurements using a diamond anvil cell and the synchrotron x-ray source at Argonne National Lab; we present data from both HP-CAT (16ID-B) and GSECARS (13BM-D). Our zero-pressure lattice parameters and unit cell volume are the following: a= 9.099(2)Å, c=4.463(2)Å, V=369.5(2)Å3; these are in precise agreement with previous determinations. Methanol-ethanol-water in a volumetric ratio of 16:3:1 was used as a pressure-transmitting medium, and the ruby fluorescence technique was used to measure pressure. We were able to observe 8-12 unambiguous diffraction peaks at all pressures, and the data from the two beamlines show excellent agreement. We see no evidence of a phase transition below 8 GPa: relative peak intensities remain constant and no new peaks are observed. The ratio of the lattice parameters, c/a, remains remarkably constant through this pressure range. A second order Birch-Murnaghan equation of state fit to our data produces an isothermal bulk modulus, K0T, of 160 ± 3 GPa (dK/dP ≡ 4). This bulk modulus is essentially the same as that of h.c.p.- iron (165 GPa), and our data thus indicate that phosphorous is likely to be a seismically invisible component of planetary cores.
Huggins S. A.
Maglio S.
Martin Donn Christopher
Santillán Javier
Scott Henry P.
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