Elasticity, bulk modulus, and mode grüneisen parameters of the HPTB molecular crystal: Computational investigation of a clathrate precursor

Darek Michalski, David R. Swanson, Craig J. Eckhardt

Research output: Contribution to journalArticle

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Abstract

Harmonie lattice dynamical calculations in the rigid-body approximation are employed to obtain frequencies of normal modes in the region of the Brillouin zone center for the hexakis(phenylthio)benzene (HPTB) molecular crystal. The intermolecular interaction for an appropriately optimized lattice structure is defined by the Buckingham potential with pertinent parameters. The velocities of the acoustic phonons are used to derive the full set of elastic constants and then the bulk modulus.. Homogenous deformation of the crystal lattice provides frequency changes of the Raman active modes which allows calculation of selected anisotropic mode Grüneisen parameters. Relaxation of the internal strains is used for a realistic modeling of the crystal response to the external strains and stresses. The anharmonicity and anisotropy of the intermolecular interaction are assessed from the derived parameters.

Original languageEnglish (US)
Pages (from-to)9506-9511
Number of pages6
JournalJournal of Physical Chemistry
Volume100
Issue number22
DOIs
StatePublished - Jan 1 1996

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Molecular crystals
clathrates
Benzene
bulk modulus
Elasticity
elastic properties
Elastic moduli
benzene
Elastic constants
Phonons
Crystal lattices
crystals
Anisotropy
Acoustics
rigid structures
Brillouin zones
crystal lattices
Crystals
phonons
interactions

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Elasticity, bulk modulus, and mode grüneisen parameters of the HPTB molecular crystal : Computational investigation of a clathrate precursor. / Michalski, Darek; Swanson, David R.; Eckhardt, Craig J.

In: Journal of Physical Chemistry, Vol. 100, No. 22, 01.01.1996, p. 9506-9511.

Research output: Contribution to journalArticle

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