Article (Scientific journals)
Lattice dynamics in elemental modulated Sb2Te3 films
Bessas, D.; Winkler, M.; Sergueev, I. et al.
2016In Physica Status Solidi A. Applications and Materials Science, 213 (3), p. 694-698
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Keywords :
Lattice dynamics; Sb2Te3; Density (specific gravity); Diffraction; Dynamics; Inelastic scattering; Lattice vibrations; Phonons; Synchrotron radiation; Synchrotrons; Correlation lengths; Density of phonon state; Detection limits; High energy synchrotron; Lattice thermal conductivity; Layered Structures; Synchrotron radiation diffractions; Crystal lattices
Abstract :
[en] The crystallinity and the lattice dynamics in elemental modulated Sb2Te3 films are investigated microscopically using high energy synchrotron radiation diffraction combined with 121Sb nuclear inelastic scattering. The correlation length is found to be finite but less than 100 Å. The element specific density of phonon states is extracted. A comparison with the element specific density of phonon states in bulk Sb2Te3 confirms that the main features in the density of phonon states arise from the layered structure. The average speed of sound at 40K, 1.74(2)kms-1, is almost the same compared to bulk Sb2Te3 at 20K, 1.78(2)kms-1. Similarly, the change in the acoustic cut-off energy is within the experimental detection limit. Thus, we suggest that the lattice thermal conductivity in elemental modulated Sb2Te3 films should not be significantly changed from its bulk value. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Disciplines :
Chemistry
Author, co-author :
Bessas, D.;  Jülich Center, Neutron Science JCNS and Peter Grünberg Institut PGI, JARA-FIT, Forschungszentrum Jülich GmbH, Jülich, Germany, Faculté des Sciences, Université de Liège, Liège, Belgium, European Synchrotron Radiation Facility, Grenoble, France
Winkler, M.;  Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstrasse 8, Freiburg, Germany
Sergueev, I.;  European Synchrotron Radiation Facility, Grenoble, France, Deutsches Elektronen-Synchrotron, Hamburg, Germany
König, J. D.;  Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstrasse 8, Freiburg, Germany
Böttner, H.;  Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstrasse 8, Freiburg, Germany, Seilerweg 5, Freiburg, Germany
Hermann, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Lattice dynamics in elemental modulated Sb2Te3 films
Publication date :
2016
Journal title :
Physica Status Solidi A. Applications and Materials Science
ISSN :
1862-6300
eISSN :
1862-6319
Publisher :
Wiley-VCH Verlag
Volume :
213
Issue :
3
Pages :
694-698
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
DFG priority program SPP1386 “Nanostructured Thermoelectrics”
Funders :
DFG - Deutsche Forschungsgemeinschaft [DE]
DOE - United States. Department of Energy [US-OR]
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