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First-order Raman scattering of rare-earth containing i-MAX single crystals (Mo2/3RE1/3)(2)AlC (RE = Nd, Gd, Dy, Ho, Er)
UCLouvain, Belgium.
Univ Grenoble Alpes, France.
Univ Grenoble Alpes, France.
Univ Grenoble Alpes, France.
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2019 (English)In: PHYSICAL REVIEW MATERIALS, ISSN 2475-9953, Vol. 3, no 5, article id 053609Article in journal (Refereed) Published
Abstract [en]

Herein, we report on the growth of single crystals of various (Mo2/3RE1/3)(2)AlC (RE = Nd, Gd, Dy, Ho, Er) i-MAX phases and their Raman characterization. Using first principles, the wave numbers of the various phonon modes and their relative atomic displacements are calculated and compared to experimental results. Twelve high-intensity Raman peaks are identified as the fingerprint of this new family of rare-earth containing i-MAX phases, thus being a useful tool to investigate their corresponding composition and structural properties. Indeed, while a redshift is observed in the low-wave-number range due to an increase of the rare-earth atomic mass when moving from left to right on the lanthanide row, a blueshift is observed for most of the high-wave-number modes due to a strengthening of the bonds. A complete classification of bond stiffnesses is achieved based on the direct dependence of a phonon mode wave number with respect to the bond stiffness. Finally, STEM images are used to confirm the crystal structure.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 3, no 5, article id 053609
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-158815DOI: 10.1103/PhysRevMaterials.3.053609ISI: 000470902400001OAI: oai:DiVA.org:liu-158815DiVA, id: diva2:1337694
Note

Funding Agencies|Federation Wallonie-Bruxelles through the Action de Recherche Concertee (ARC) on 3D nanoarchitecturing of 2D crystals [16/21-077]; European Unions Horizon 2020 researchers and innovation program [696656]; Belgium FNRS; Agence Nationale de la Recherche [ANR-18-CE09-0041]; Nanosciences Foundation (Universite Grenoble-Alpes Foundation); Swedish Foundation for Strategic Research (SSF) [EM16-0004]; Knut and Alice Wallenberg (KAW) Foundation [KAW2015.0043]; Fonds de la Recherche Scientifique de Belgique (F.R.S.- FNRS) [2.5020.11]

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-07-16

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