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Science 15 August 1997:
Vol. 277. no. 5328, pp. 930 - 933
DOI: 10.1126/science.277.5328.930
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Reports
Structure, Bonding, and Geochemistry of Xenon at High Pressures
Wendel A. Caldwell,
Jeffrey H. Nguyen,
Bernd G. Pfrommer,
Francesco Mauri,
Steven G. Louie,
Raymond Jeanloz
Although xenon becomes metallic at pressures above about 100 gigapascals, a combination of quantum mechanical calculations and high
pressure-temperature experiments reveals no tendency on the part of
xenon to form a metal alloy with iron or platinum to at least 100 to
150 gigapascals. The transformation of xenon from face-centered cubic
(fcc) to hexagonal close-packed (hcp) structures is kinetically
hindered, the differences in volume and bulk modulus between the two
phases being smaller than we can resolve (less than 0.3 percent and 0.6 gigapascals, respectively). The equilibrium fcc-hcp phase boundary is
at 21 (±3) gigapascals, which is a lower pressure than was previously
thought, and it is unlikely that Earth's core serves as a reservoir
for primordial xenon.
W. A. Caldwell and R. Jeanloz, Department of Geology and
Geophysics, University of California, Berkeley, CA 94720, USA.
J. H. Nguyen, Department of Physics, University of California,
Berkeley, CA 94720, USA.
B. G. Pfrommer, F. Mauri, S. G. Louie, Department of Physics,
University of California, Berkeley, CA 94720, USA, and Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA
94720, USA.
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