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High Contrast Thermal Conductivity Change in Ni-Mn-In Heusler Alloys near Room Temperature
Stockholm University, Faculty of Science, Department of Physics. Halmstad University, Sweden.
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Number of Authors: 52019 (English)In: Advanced Engineering Materials, ISSN 1438-1656, E-ISSN 1527-2648, Vol. 21, no 5, article id 1801342Article in journal (Refereed) Published
Abstract [en]

Materials with an abrupt transition between a low and a high thermal conductance state at a critical temperature would be useful for thermal regulation applications. Here, the authors report a high contrast reversible thermal conductivity change through the thermally-induced martensitic transition (MT) in Ni-Mn-In alloys. The authors measure the thermal conductivity of a wide temperature range 130 < T < 530 K using time-domain thermoreflectance (TDTR). The thermal conductivity of these alloys increases from approximate to 7.0-8.5 W m(-1) K-1 to approximate to 11.5-13.0 W m(-1) K-1 through the MT near 300 K as temperature rises, with a rate of change among the highest yet reported in solid-state materials with thermally-induced phase transitions. Based on Hall resistivity measurements, the authors further show that the change of thermal conductivity is dominated by the electronic contribution, which results from a unique carrier mobility change through the MT. Their findings highlight the interplay between the structural disorders and the thermal transport in alloys through solid-state phase transitions and open a new avenue in the search of high-performance materials for thermal regulation.

Place, publisher, year, edition, pages
2019. Vol. 21, no 5, article id 1801342
Keywords [en]
Hall mobility, Heusler alloys, martensitic transition, thermal conductivity regulation, time-domain thermoreflectanc
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:su:diva-171171DOI: 10.1002/adem.201801342ISI: 000473099800003OAI: oai:DiVA.org:su-171171DiVA, id: diva2:1343446
Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved

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