Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals
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...
| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2019-01-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5038676 |
| _version_ | 1811198238075650048 |
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| author | A. Jeżowski M. A. Strzhemechny A. I. Krivchikov O. S. Pyshkin O. O. Romantsova O. A. Korolyuk D. I. Zloba Yu. V. Horbatenko A. Filatova |
| author_facet | A. Jeżowski M. A. Strzhemechny A. I. Krivchikov O. S. Pyshkin O. O. Romantsova O. A. Korolyuk D. I. Zloba Yu. V. Horbatenko A. Filatova |
| author_sort | A. Jeżowski |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-12T01:28:46Z |
| format | Article |
| id | doaj.art-9e6bc5c882b54d86af9be333567aecf4 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-04-12T01:28:46Z |
| publishDate | 2019-01-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-9e6bc5c882b54d86af9be333567aecf42022-12-22T03:53:33ZengAIP Publishing LLCAIP Advances2158-32262019-01-0191015121015121-710.1063/1.5038676073901ADVThermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystalsA. Jeżowski0M. A. Strzhemechny1A. I. Krivchikov2O. S. Pyshkin3O. O. Romantsova4O. A. Korolyuk5D. I. Zloba6Yu. V. Horbatenko7A. Filatova8Institute of Low Temperature and Structure Research, PAS, 2 Okólna Str. 50-422, Wrocław, PolandB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineInstitute of Low Temperature and Structure Research, PAS, 2 Okólna Str. 50-422, Wrocław, PolandB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineB. Verkin Institute for Low Temperature Physics and Engineering, NASU, 47 Nauki Ave., Kharkov 61103, UkraineInstitute of Low Temperature and Structure Research, PAS, 2 Okólna Str. 50-422, Wrocław, PolandThermal 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.http://dx.doi.org/10.1063/1.5038676 |
| spellingShingle | A. Jeżowski M. A. Strzhemechny A. I. Krivchikov O. S. Pyshkin O. O. Romantsova O. A. Korolyuk D. I. Zloba Yu. V. Horbatenko A. Filatova Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals AIP Advances |
| title | Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals |
| title_full | Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals |
| title_fullStr | Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals |
| title_full_unstemmed | Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals |
| title_short | Thermoactivated heat transfer mechanism in molecular crystals: Thermal conductivity of benzophenone single crystals |
| title_sort | thermoactivated heat transfer mechanism in molecular crystals thermal conductivity of benzophenone single crystals |
| url | http://dx.doi.org/10.1063/1.5038676 |
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