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Role of Disorder in the Thermodynamics and Atomic Dynamics of Glasses

Title data

Chumakov, Aleksandr I. ; Monaco, G. ; Fontana, A. ; Bosak, Alexeï ; Hermann, R. P. ; Bessas, D. ; Wehinger, Björn ; Crichton, Wilson A. ; Krisch, Michael ; Rüffer, Rudolf ; Baldi, G. ; Carini, G. ; Carini Jr., G. ; D'Angelo, G. ; Gilioli, E. ; Tripodo, G. ; Zanatta, M. ; Winkler, Björn ; Milman, V. ; Refson, K. ; Dove, M. T. ; Dubrovinskaia, Natalia ; Dubrovinsky, Leonid ; Keding, R. ; Yue, Y. Z.:
Role of Disorder in the Thermodynamics and Atomic Dynamics of Glasses.
In: Physical Review Letters. Vol. 112 (January 2014) . - 025502.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.112.025502

Official URL: Volltext

Project information

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

We measured the density of vibrational states (DOS) and the specific heat of various glassy and crystalline polymorphs of SiO2. The typical (ambient) glass shows a well-known excess of specific heat relative to the typical crystal (α-quartz). This, however, holds when comparing a lower-density glass to a higher-density crystal. For glassy and crystalline polymorphs with matched densities, the DOS of the glass appears as the smoothed counterpart of the DOS of the corresponding crystal; it reveals the same number of the excess states relative to the Debye model, the same number of all states in the low-energy region, and it provides the same specific heat. This shows that glasses have higher specific heat than crystals not due to disorder, but because the typical glass has lower density than the typical crystal.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen > Professur Materialphysik und Technologie bei extremen Bedingungen - Univ.-Prof. Dr. Natalia Doubrovinckaia
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 02 Feb 2015 15:33
Last Modified: 01 Dec 2016 08:39
URI: https://eref.uni-bayreuth.de/id/eprint/6169