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Neutron scattering measurements of phonons in nickel at elevated temperatures

Kresch, M. and Delaire, O. and Stevens, R. and Lin, J. Y. Y. and Fultz, B. (2007) Neutron scattering measurements of phonons in nickel at elevated temperatures. Physical Review B, 75 (10). Art. No. 104301. ISSN 1098-0121. http://resolver.caltech.edu/CaltechAUTHORS:KREprb07

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Abstract

Measurements of elastic and inelastic neutron scatterings from elemental nickel were made at 10, 300, 575, 875, and 1275 K. The phonon densities of states (DOSs) were calculated from the inelastic scattering and were fit with Born–von Kármán models of the lattice dynamics. With ancillary data on thermal expansion and elastic moduli, we found a small, negative anharmonic contribution to the phonon entropy at high temperature. We used this to place bounds on the magnetic entropy of nickel. A significant broadening of the phonon DOS at elevated temperatures, another indication of anharmonicity, was also measured and quantified.


Item Type:Article
ORCID:
AuthorORCID
Lin, J. Y. Y.0000-0001-9233-0100
Fultz, B.0000-0002-6364-8782
Additional Information:© 2007 The American Physical Society. (Received 7 November 2006; published 9 March 2007) We thank Frans Trouw and Markus Hehlen for their support during the Pharos experiment. This work has benefited from the use of the Los Alamos Neutron Science Center at the Los Alamos National Laboratory. This facility is funded by the U.S. Department of Energy under Contract No. DEAC52-06NA25396. This work was supported by the Department of Energy through the Basic Energy Sciences Grant DE-FG02-03ER46055.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-AC52-06NA25396
Department of Energy (DOE)DE-FG02-03ER46055
Subject Keywords:neutron diffraction; phonons; nickel; thermal expansion; elastic moduli; entropy; anharmonic lattice modes
Record Number:CaltechAUTHORS:KREprb07
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:KREprb07
Alternative URL:http://dx.doi.org/10.1103/PhysRevB.75.104301
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7593
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:10 Mar 2007
Last Modified:31 Oct 2017 18:12

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