Structural effects of high pressure gas on the rotator phases of normal alkanes

Autor:	Eric B. Sirota, Hubert E. King, D. M. Singer
Rok vydání:	1994
Předmět:	Argon Condensed matter physics Scattering Chemistry Anharmonicity General Physics and Astronomy chemistry.chemical_element Molecular physics Heat capacity Thermal expansion Compressibility Physics::Chemical Physics Physical and Theoretical Chemistry Helium Bar (unit)
Zdroj:	The Journal of Chemical Physics. 100:1542-1551
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.466633
Popis:	The effects of high pressure gases (P≤400 bar) on the RII, RI, and RV rotator phases of 21, 23, and 25 carbon normal alkanes were studied via x‐ray scattering. We have measured the pressure and temperature dependence of the rotator structures and present these results in terms of the essential structural parameters: layer spacing, area per molecule, lattice distortion, and tilt. The pressure was generated by one of three gases: helium, nitrogen, or argon. In the rotator phases, argon and nitrogen intercalate between the layers while helium acts mostly as a noninteracting pressurizing medium. The thermal expansion and compressibility are anomalously large in the rotator phases, and this implies that the heat capacity in the rotator phases is dominated by anharmonic effects.
Databáze:	OpenAIRE
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