Thermal conductivity, heat capacity and phase diagram of cyclooctanol in liquid, solid and glassy crystal states under high pressure
- 20 October 1990
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 71 (3) , 523-539
- https://doi.org/10.1080/00268979000101951
Abstract
Using the transient hot-wire method, thermal conductivity and heat capacity per unit volume are measured for solid and liquid phases and glassy crystal states of cyclooctanol, and information is provided on the phase diagram under high pressure. A new solid phase (III) is detected and characterized as a normal crystal phase, whereas all other solid phases (I, II, IV, V) are characterized as plastic crystal phases. We find evidence that the plastic crystal phases I, II and IV could each be the source for a distinct glassy crystal state. It is argued for phase II that its possession of both a low thermal conductivity and a low dielectric permittivity could be accounted for by assuming restricted reorientational motion of the molecules. The unusual (although small) decrease of thermal conductivity observed through the glassy to plastic crystal transitions may indicate that phonons can couple to reorientational motion in the plastic crystal phases I, II and IV.Keywords
This publication has 22 references indexed in Scilit:
- Chirality and the thermophysical properties of molecular solid phases under pressure: (+)- and (±)-camphorMolecular Physics, 1990
- Thermodynamic study on camphor crystalsThermochimica Acta, 1989
- Thermal conductivity of crystalline and glassy crystal cyclohexanol under pressureMolecular Physics, 1989
- Thermal conductivity of solids and liquids under pressureReports on Progress in Physics, 1984
- Temperature dependence of rotational isomerisation and molecular reorientation rates in plastic succinonitrileJournal of Physics C: Solid State Physics, 1983
- Thermal conductivity and heat capacity of cyclohexane under pressureJournal of Physics and Chemistry of Solids, 1978
- Heat capacity and thermal conductivity from pulsed wire probe measurements under pressureJournal of Physics E: Scientific Instruments, 1977
- Order–disorder transitions in substituted adamantanesJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1977
- Pre-melting transitions in caged hydrocarbons, a general theory of disorder in plastic crystalsJournal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases, 1974
- Phase Changes in Crystalline and Glassy-Crystalline CyclohexanolBulletin of the Chemical Society of Japan, 1968