Heat transport by phonons and the generation of heat by fast phonon processes in ferroelastic materials

Ding, X and Salje, E. K. H. (2015) Heat transport by phonons and the generation of heat by fast phonon processes in ferroelastic materials. AIP Adances, 5 (ARTN 0). ISSN 2158-3226 DOI https://doi.org/10.1063/1.4921899

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Thermal conductivity of ferroelastic device materials can be reversibly controlled by strain. The nucleation and growth of twin boundaries reduces thermal conductivity if the heat flow is perpendicular to the twin wall. The twin walls act as phonon barriers whereby the thermal conductivity decreases linearly with the number of such phonon barriers. Ferroelastic materials also show elasto-caloric properties with a high frequency dynamics. The upper frequency limit is determined by heat generation on a time scale, which is some 5 orders of magnitude below the typical bulk phonon times. Some of these nano-structural processes are irreversible under stress release (but remain reversible under temperature cycling), in particular the annihilation of needle domains that are a key indicator for ferroelastic behaviour in multiferroic materials.

Item Type: Article
Additional Information: © The Authors
Uncontrolled Keywords: 2015AREP; IA69;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
07 - Gold Open Access
Journal or Publication Title: AIP Adances
Volume: 5
Identification Number: https://doi.org/10.1063/1.4921899
Depositing User: Sarah Humbert
Date Deposited: 09 Jul 2015 18:17
Last Modified: 30 Aug 2015 00:16
URI: http://eprints.esc.cam.ac.uk/id/eprint/3402

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