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Vibrational entropy-enhanced magnetocaloric effect in Mn-rich high-entropy alloys
Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, China; Department of Physics and Astronomy, Division of Materials Theory, Uppsala University, Uppsala, Sweden.
State Key Laboratory of Mechanical Transmissions, College of Materials Science and Engineering, Chongqing University, Chongqing, China; National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, China.
Department of Materials Engineering, Isfahan University of Technology, Isfahan, Iran; Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden.
Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden.
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2021 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 119, no 8, article id 084102Article in journal (Refereed) Published
Abstract [en]

We investigate the AlxCr0.2MnFe0.5Co0.3Ni0.5 (0.3 <= x <= 0.7) high-entropy alloys by combining experimental and theoretical techniques. X-ray diffraction and magnetization measurements indicate that Al alters the crystal structure and the entropy change upon magnetization-demagnetization while keeping the Curie temperature almost unchanged. First-principles calculations of the vibrational, magnetic, electronic, and configurational entropies show that the leading entropy change is due to the magnetic and vibrational degrees of freedom. The presence of the body-centered-cubic phase, showing a sizable elastic softening upon magnetic transition, brings about the substantial magnetocaloric effect in this family of alloys.

Place, publisher, year, edition, pages
American Institute of Physics (AIP), 2021. Vol. 119, no 8, article id 084102
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:oru:diva-93994DOI: 10.1063/5.0064308ISI: 000688211700006Scopus ID: 2-s2.0-85114039392OAI: oai:DiVA.org:oru-93994DiVA, id: diva2:1590004
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilEuropean CommissionVinnova, 2019-05111Carl Tryggers foundation Swedish Energy Agency
Note

Funding Agency:

Orszagos Tudomanyos Kutatasi Alapprogramok (OTKA) 128229

Available from: 2021-09-01 Created: 2021-09-01 Last updated: 2023-12-08Bibliographically approved

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Eriksson, Olle

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