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Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys
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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.
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LASHLEY, J. C., et al. Contribution of low-frequency modes to the specific heat of Cu-Zn-Al shape-memory alloys. Physical Review B. 2007. Vol. 75, núm. 6, pàgs. 064304-1-064304-7. ISSN 0163-1829. [consulta: 8 de maig de 2026]. Disponible a: https://hdl.handle.net/2445/10582