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Temperature dependence of the phonon entropy of vanadium

Bogdanoff, P. D. and Fultz, B. and Robertson, J. L. and Crow, L. (2002) Temperature dependence of the phonon entropy of vanadium. Physical Review B, 65 (1). Art. No. 014303. ISSN 0163-1829. http://resolver.caltech.edu/CaltechAUTHORS:BOGprb02

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Abstract

The phonon density-of-states (DOS) of elemental vanadium was measured at elevated temperatures by inelastic neutron scattering. The phonon softening predicted by thermal expansion against the bulk modulus is much larger than the measured shifts in phonon energies. We conclude that the phonon anharmonicities associated with thermal expansion are largely canceled by effects from phonon-phonon scattering. Prior measurements of the heat capacity and calculations of the electronic entropy of vanadium are assessed, and consistency requires an explicit temperature dependence of the phonon DOS. Using data from the literature, similar results are found for chromium, niobium, titanium, and zirconium.


Item Type:Article
Additional Information:©2001 The American Physical Society Received 20 July 2001; published 12 December 2001 This work was supported by the U.S. Department of Energy under Contract No. DE-FG03-96ER45572 and BESMS, W-31-109-ENG-38.
Record Number:CaltechAUTHORS:BOGprb02
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BOGprb02
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.65.014303
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2905
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:05 May 2006
Last Modified:26 Dec 2012 08:51

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