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Magnitude and Origin of the Difference in Vibrational Entropy between Ordered and Disordered Fe3Al

Anthony, L. and Nagel, L. J. and Okamoto, J. K. and Fultz, B. (1994) Magnitude and Origin of the Difference in Vibrational Entropy between Ordered and Disordered Fe3Al. Physical Review Letters, 73 (22). pp. 3034-3038. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:ANTprl94

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Abstract

The difference in vibrational entropy between chemically disordered and DO3-ordered Fe3Al was measured by calorimetry to be (0.10 ± 0.03) kB/atom at high temperatures, with the ordered alloy having the lower vibrational entropy. Analysis of the vibrational modes of the ordered and disordered alloys with a Born-von Kármán model showed that the lower vibrational entropy of the ordered alloy originates from high-frequency optical modes involving large-amplitude vibrations of the aluminum-rich sublattice.


Item Type:Article
Additional Information:©1994 The American Physical Society Received 1 August 1994 We acknowledge the help amd interest of Dr. C. C. Ahn and conversations with G. Ackland, G. D. Garulsky, and G. Ceder. This work was supported by the U.S. Department of Energy under Contract No. DE-FG03-86ER45270.
Record Number:CaltechAUTHORS:ANTprl94
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:ANTprl94
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.73.3034
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1827
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:20 Feb 2006
Last Modified:18 Sep 2014 18:11

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