X-ray diffraction and equation of state of solid neon to 110 GPa

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.11820· OSTI ID:6192121

Hemley, R J; Zha, C S; Jephcoat, A P; Mao, H K; Finger, L W; Cox, D E

Solid neon was compressed under static conditions at 300 K to pressures in the 100 GPa (megabar) range using diamond-anvil cell techniques. The crystal structure and /ital P/-/ital V/ equation of state were determined by energy-dispersive x-ray diffraction with microcollimated synchrotron radiation. Pressures were determined from ruby fluorescence spectra and from x-ray diffraction of tungsten powder contained within the sample. Solid neon remains an insulator with the fcc structure to the maximum pressure of 110 GPa at 300 K, where the compression /ital V///ital V//sub 0/ is 0.28. The 300-K /ital P/-/ital V/ isotherm measured at high pressure is in excellent agreement with the results of electronic structure calculations but is incorrectly described by pure pair potentials recently developed for neon. These results indicate that there is a significant softening of the material by many-body interactions at high pressures. Finally, the measurements of ruby fluorescence and tungsten x-ray diffraction in the neon medium obtained in this study provide an extension of the quasihydrostatic ruby pressure scale above 100 GPa.

• Research Organization: Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 20008(US); Department of Physics, Brookhaven National Laboratory, Upton, New York 11973
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6192121
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIAGRAMS
DIFFRACTION
ELEMENTS
EQUATIONS
EQUATIONS OF STATE
FLUIDS
GASES
MEDIUM TEMPERATURE
NEON
NONMETALS
PHASE DIAGRAMS
PHASE STUDIES
RARE GASES
SCATTERING
SOLIDS
VERY HIGH PRESSURE
X-RAY DIFFRACTION