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Manipulating the stability of crystallographic and magnetic sub-lattices: A first-order magnetoelastic transformation in transition metal based Laves phase

TitleManipulating the stability of crystallographic and magnetic sub-lattices: A first-order magnetoelastic transformation in transition metal based Laves phase
Publication TypeJournal Article
Year of Publication2018
AuthorsYibole, H, Pathak, AK, Mudryk, Y, Guillou, F, Zarkevich, N, Gupta, S, Balema, V, Pecharsky, VK
JournalActa Materialia
Volume154
Pagination365-374
Date Published08
Type of ArticleArticle
ISBN Number1359-6454
Accession NumberWOS:000437968900035
Keywordsalloy, alloys, augmented-wave method, grain-refinement, hf1-xtaxfe2, Magnetic properties, Magneto-elastic, Magnetocaloric, Materials Science, Metallurgical Engineering, negative thermal expansion, negative thermal-expansion, properties, Structure-properties relationship, system, transformation
Abstract

ate to -15 x 10(-6)K(-1) observed over a 90 K broad temperature range, which is uncommon for magnetoelastic NTE materials. Density functional theory calculations and microstructural analyses demonstrate that the unusual broadness of the FOMT originates from phase separation between ferro- and antiferromagnetic phases, which in turn is rooted in partial segregation of Hf and Nb and a peculiar microstructure. This new understanding of the composition-structure-property relationships in transition metal based Laves phases is an essential step toward a better control and more precise tailoring of rich functionalities in this group of material. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

DOI10.1016/j.actamat.2018.05.048
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Alternate JournalActa Mater.