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Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals
- Source :
- AIP Advances, Vol 9, Iss 1, Pp 015121-015121-7 (2019)
- Publication Year :
- 2019
- Publisher :
- AIP Publishing LLC, 2019.
-
Abstract
- Thermal conductivities of two benzophenone single crystals have been measured at temperatures from 4.7 to 270 K. The experimental data for both are consistent for temperatures above 15 K. The thermal conductivity of benzophenone can be represented as a sum of two contributions: κ1 + κTA where κ1 is due to the standard phonon mechanisms accepted for ordered crystals and κTA takes into account the heat flow due to intermolecular hopping of thermally activated intramolecular vibrational modes. The thermal activation contribution in unsubstituted benzophenone is substantially smaller when compared to that in any of the two para-bromobenzophenone polymorphs studied previously. Unlike in the 4-bromobenzophenone crystals, the microscopic agent responsible for intramolecular excitation(s) was not determined. The characteristic intramolecular excitation energy was evaluated to be 220 K, about three times less compared to 4-bromobenzophenone.
- Subjects :
- 010302 applied physics
Materials science
Phonon
Intermolecular force
General Physics and Astronomy
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
lcsh:QC1-999
chemistry.chemical_compound
Thermal conductivity
chemistry
Chemical physics
Intramolecular force
Molecular vibration
0103 physical sciences
Heat transfer
Benzophenone
0210 nano-technology
Excitation
lcsh:Physics
Subjects
Details
- Language :
- English
- ISSN :
- 21583226
- Volume :
- 9
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- AIP Advances
- Accession number :
- edsair.doi.dedup.....49e458a2e72be8326793b13e93f353b5