Melting and orientational epitaxy in argon and xenon monolayers on graphite

Journal Article · Thu Mar 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.4368· OSTI ID:6925393

D'Amico, K L ^[1]; Bohr, J ^[2]; Moncton, D E ^[3]; Gibbs, D ^[4]

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1. Department of Physics, Brookhaven National Laboratory, Upton, New York, 11973-5000 (USA) Corporate Research Laboratories, Exxon Research and Engineering Company, Clinton Township, Route 22 East, Annandale, New Jersey 08801 (USA)
2. Department of Physics, Risoe National Laboratory, DK-4000 Roskilde, Denmark (DK) Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000 (USA)
3. Corporate Research Laboratories Exxon Research and Engineering Company, Clinton Township, Route 22 East, Annandale, New Jersey 08801 (USA)
4. Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000 (USA)

We have studied the melting behavior for Ar at a coverage of {rho}{similar to}0.81 and the orientational-epitaxy effect for Ar and Xe. We find that the Ar melts continuously from a rotated incommensurate solid to a rotated fluid phase; the fluid with positional correlations of 400 {ital A} is rotated by {similar to}2{degree}. The melting behavior agrees well with that observed by x-ray diffraction using a {ital ZYX}-graphite substrate, and is consistent with the heat-capacity data of Migone {ital et} {ital al}. For Xe, the orientational-epitaxy data show a rotation to zero for increasing misfit magnitude, contrary to the Ar and Kr behavior. This is discussed in light of the role of entropy in the structure of this system.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6925393
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:7; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ADSORPTION
ARGON
CARBON
COATINGS
COHERENT SCATTERING
DIFFRACTION
ELEMENTAL MINERALS
ELEMENTS
EPITAXY
FLUIDS
GASES
GRAPHITE
MELTING
MINERALS
MOTION
NONMETALS
ORIENTATION
PHASE TRANSFORMATIONS
RARE GASES
ROTATION
SCATTERING
SORPTION
X-RAY DIFFRACTION
XENON