Pressure dependence of the orientational ordering in solid C sub 60
- Sandia National Laboratories, Albuquerque, New Mexico (USA)
Pressure studies of the molecular orientational ordering in solid C{sub 60} have exhibited three principal effects: (1) The simple-cubic (sc) to face-centered-cubic (fcc) ordering transition temperature ({ital T}{sub {ital c}}=249 K) increases with pressure at a rate of 10.4{plus minus}0.2 K/kbar corresponding to ln{ital T}{sub {ital c}}/{ital d} ln{ital a}{sub 0}={minus}22.8, where {ital a}{sub 0} is the lattice parameter; (2) pressure greatly reduces orientational fluctuations of the C{sub 60} molecules in the ordered low-temperature sc phase; and (3) the results suggest the presence of two ordering transitions instead of one near 249 K. The implications of these results are discussed.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6220525
- Journal Information:
- Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 67:22; ISSN PRLTA; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602* -- Other Materials-- Structure & Phase Studies
CARBON
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
ELEMENTS
FLUCTUATIONS
MOLECULES
NONMETALS
ORIENTATION
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
VARIATIONS