This title appears in the Scientific Report :
2011
Please use the identifier:
http://dx.doi.org/10.1002/adfm.201002274 in citations.
Phase-Change Materials: Vibrational Softening upon Crystallization and Its Impact on Thermal Properties
Phase-Change Materials: Vibrational Softening upon Crystallization and Its Impact on Thermal Properties
Crystallization of an amorphous solid is usually accompanied by a significant change of transport properties, such as an increase in thermal and electrical conductivity. This fact underlines the importance of crystalline order for the transport of charge and heat. Phase-change materials, however, re...
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Personal Name(s): | Matsunaga, T. |
---|---|
Yamada, N. / Kojima, R. / Shamoto, S. / Sato, M. / Tanida, H. / Uruga, T. / Kohara, S. / Takata, M. / Zalden, P. / Bruns, G. / Sergueev, I. / Wille, H. C. / Hermann, R. / Wuttig, M. | |
Contributing Institute: |
Streumethoden; PGI-4 Streumethoden; JCNS-2 JARA-FIT; JARA-FIT |
Published in: | Advanced functional materials, 21 (2011) S. 2232 - 2239 |
Published in: |
Article first published online: 26 APR 2011 |
Imprint: |
Weinheim
Wiley-VCH
2011
|
Physical Description: |
2232 - 2239 |
DOI: |
10.1002/adfm.201002274 |
Document Type: |
Journal Article |
Research Program: |
Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) Grundlagen für zukünftige Informationstechnologien |
Series Title: |
Advanced Functional Materials
21 |
Subject (ZB): | |
Publikationsportal JuSER |
Crystallization of an amorphous solid is usually accompanied by a significant change of transport properties, such as an increase in thermal and electrical conductivity. This fact underlines the importance of crystalline order for the transport of charge and heat. Phase-change materials, however, reveal a remarkably low thermal conductivity in the crystalline state. The small change in this conductivity upon crystallization points to unique lattice properties. The present investigation reveals that the thermal properties of the amorphous and crystalline state of phase-change materials show remarkable differences such as higher thermal displacements and a more pronounced anharmonic behavior in the crystalline phase. These findings are related to the change of bonding upon crystallization, which leads to an increase of the sound velocity and a softening of the optical phonon modes at the same time. |