Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys
We report a comparison of the specific-heat measurements on isoelectronic Cu-Zn-Al shape-memory alloys in the parent cubic phase L21 and in the close-packed martensitic phase 18R. Measurements were made by thermal-relaxation calorimetry over the temperature range 1.9 T 300 K. For the close-packed ma...
| Autores: | , , , , , , , |
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| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | España |
| Recursos: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/10582 |
| Acesso em linha: | https://hdl.handle.net/2445/10582 |
| Access Level: | acceso abierto |
| Palavra-chave: | Dispersió (Física nuclear) Fonons Aliatges Scattering (Physics) Phonons Alloys |
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Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloysLashley, J. C.Drymiotis, F. R.Safarik, D. J.Smith, J. L.Romero, RicardoFisher, R. A.Planes Vila, AntoniMañosa, LluísDispersió (Física nuclear)FononsAliatgesScattering (Physics)PhononsAlloysWe report a comparison of the specific-heat measurements on isoelectronic Cu-Zn-Al shape-memory alloys in the parent cubic phase L21 and in the close-packed martensitic phase 18R. Measurements were made by thermal-relaxation calorimetry over the temperature range 1.9 T 300 K. For the close-packed martensitic phase we find that the specific heat behaves similarly to that of pure copper which is also close packed. However, we observe deviations from Debye behavior for the cubic phase at low temperatures. This deviation is accounted for by the addition of 5% of Einstein localized modes to the Debye modes. Although the microscopic origin remains unknown, it was anticipated that it is related to the well-known softening of the TA2 110 phonon branch. In order to address this hypothesis an analysis of the lattice heat capacity of the cubic phase was compared to the calculated lattice heat capacity of -brass, as determined by integrating over the phonon density of states. A similar comparison was made between the close-packed phase and -brass.The American Physical Society200920092007info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion7 p.application/pdfhttps://hdl.handle.net/2445/10582Articles publicats en revistes (Física Quàntica i Astrofísica)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció digital del document publicat en format paper, proporcionada per http://dx.doi.org/10.1103/PhysRevB.75.064304Physical Review B, 2007, vol. 75, núm. 6, p. 064304-1-064304-7http://dx.doi.org/10.1103/PhysRevB.75.064304(c) The American Physical Society, 2007info:eu-repo/semantics/openAccessoai:recercat.cat:2445/105822026-05-29T05:05:01Z |
| dc.title.none.fl_str_mv |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| title |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| spellingShingle |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys Lashley, J. C. Dispersió (Física nuclear) Fonons Aliatges Scattering (Physics) Phonons Alloys |
| title_short |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| title_full |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| title_fullStr |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| title_full_unstemmed |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| title_sort |
Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys |
| dc.creator.none.fl_str_mv |
Lashley, J. C. Drymiotis, F. R. Safarik, D. J. Smith, J. L. Romero, Ricardo Fisher, R. A. Planes Vila, Antoni Mañosa, Lluís |
| author |
Lashley, J. C. |
| author_facet |
Lashley, J. C. Drymiotis, F. R. Safarik, D. J. Smith, J. L. Romero, Ricardo Fisher, R. A. Planes Vila, Antoni Mañosa, Lluís |
| author_role |
author |
| author2 |
Drymiotis, F. R. Safarik, D. J. Smith, J. L. Romero, Ricardo Fisher, R. A. Planes Vila, Antoni Mañosa, Lluís |
| author2_role |
author author author author author author author |
| dc.subject.none.fl_str_mv |
Dispersió (Física nuclear) Fonons Aliatges Scattering (Physics) Phonons Alloys |
| topic |
Dispersió (Física nuclear) Fonons Aliatges Scattering (Physics) Phonons Alloys |
| description |
We report a comparison of the specific-heat measurements on isoelectronic Cu-Zn-Al shape-memory alloys in the parent cubic phase L21 and in the close-packed martensitic phase 18R. Measurements were made by thermal-relaxation calorimetry over the temperature range 1.9 T 300 K. For the close-packed martensitic phase we find that the specific heat behaves similarly to that of pure copper which is also close packed. However, we observe deviations from Debye behavior for the cubic phase at low temperatures. This deviation is accounted for by the addition of 5% of Einstein localized modes to the Debye modes. Although the microscopic origin remains unknown, it was anticipated that it is related to the well-known softening of the TA2 110 phonon branch. In order to address this hypothesis an analysis of the lattice heat capacity of the cubic phase was compared to the calculated lattice heat capacity of -brass, as determined by integrating over the phonon density of states. A similar comparison was made between the close-packed phase and -brass. |
| publishDate |
2007 |
| dc.date.none.fl_str_mv |
2007 2009 2009 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| format |
article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2445/10582 |
| url |
https://hdl.handle.net/2445/10582 |
| dc.language.none.fl_str_mv |
Inglés |
| language_invalid_str_mv |
Inglés |
| dc.relation.none.fl_str_mv |
Reproducció digital del document publicat en format paper, proporcionada per http://dx.doi.org/10.1103/PhysRevB.75.064304 Physical Review B, 2007, vol. 75, núm. 6, p. 064304-1-064304-7 http://dx.doi.org/10.1103/PhysRevB.75.064304 |
| dc.rights.none.fl_str_mv |
(c) The American Physical Society, 2007 info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
(c) The American Physical Society, 2007 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
7 p. application/pdf |
| dc.publisher.none.fl_str_mv |
The American Physical Society |
| publisher.none.fl_str_mv |
The American Physical Society |
| dc.source.none.fl_str_mv |
Articles publicats en revistes (Física Quàntica i Astrofísica) reponame:Recercat. Dipósit de la Recerca de Catalunya instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
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Recercat. Dipósit de la Recerca de Catalunya |
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Recercat. Dipósit de la Recerca de Catalunya |
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15,812429 |