Pressure dependence of the orientational ordering in solid C sub 60

Journal Article · Mon Nov 25 04:00:00 EST 1991 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.67.3136· OSTI ID:6220525

Samara, G A; Schirber, J E; Morosin, B; Hansen, L V; Loy, D; Sylwester, A P ^[1]

---

1. 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

Related Subjects

36 MATERIALS SCIENCE
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