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

1 Scopus citations

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 - 1996

ASJC Scopus subject areas

  • Engineering(all)
  • Physical and Theoretical Chemistry

Fingerprint Dive into the research topics of 'Elasticity, bulk modulus, and mode grüneisen parameters of the HPTB molecular crystal: Computational investigation of a clathrate precursor'. Together they form a unique fingerprint.

  • Cite this