Effects of site-occupation disorder on the low-temperature thermal conductivity of molecular crystals
| Autor: | Daria Szewczyk, O. A. Korolyuk, G. A. Vdovichenko, Andrzej Jeżowski, Alexander I. Krivchikov, J. Ll. Tamarit, Luis Carlos Pardo, Francisco Javier Bermejo |
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| Přispěvatelé: | Generalitat de Catalunya, Ministerio de Ciencia e Innovación (España), National Academy of Sciences of Ukraine, Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya. GCM - Grup de Caracterització de Materials |
| Rok vydání: | 2015 |
| Předmět: |
Phase-diagram
Materials science Espectroscòpia molecular Phonon Phonon scattering chemistry.chemical_element Calorimetry Glassy features Thermal conductivity Glass-transition Materials Chemistry Phase diagram Liquid Fonons Bromine Occupational disorder Condensed matter physics Mixed-crystals Condensed Matter Physics Molecular spectroscopy Electronic Optical and Magnetic Materials Wavelength chemistry Ceramics and Composites Phonons Model glass Física::Física molecular [Àrees temàtiques de la UPC] Crossed isodimorphism Glass transition |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Recercat. Dipósit de la Recerca de Catalunya Universitat Jaume I UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 0022-3093 |
| Popis: | 8 pags.; 4 figs.; 3 tabs.; 7th IDMRCS: Relaxation in Complex Systems © 2014 Elsevier B.V. All rights reserved. The thermal conductivity of CBrnCl4 -n,(n = 0,1,2) and 2-adamantanone (C10H14O) crystals which exhibit substitutional disorder has been measured for temperatures between 2 K and 150 K. Such temperatures comprise signatures of dynamical processes involving the site occupancy of the chlorine and bromine atoms for CBrnCl4 -n,(n = 0,1,2) and the oxygen atom for (C10H14O), as it has been revealed by both, calorimetry and spectroscopic techniques. The data analysis is carried out in terms of several phonon scattering channels contributing to a resistive relaxation rate which can be represented by two contributions due to propagating phonons whose mean-free path exceeds half the phonon wavelength as well as a term attributed to localized short wavelength modes. The implications of the present findings for studies pertaining to glassy dynamics are briefly discussed. This work is supported by the Spanish Ministry of Science and Innovation (grant no. FIS2011-24439), the Catalonia Government (grant no. 2009SGR-1251). The authors acknowledge the support from the National Academy of Science of Ukraine in the frame of the joint Ukrainian– Russian Project (agreement no. 10-2012) on the subject “Metastable states of simple condensed systems”. One of us A.I. K. thanks the Spanish Ministry of Education (grant SAB2011-0070) for an invited position at the Universitat Politècnica de Catalunya. |
| Databáze: | OpenAIRE |
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