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An investigation of the in-plane chemically ordered atomic laminates (Mo2/3Sc1/3)(2)AlC and (Mo2/3Y1/3)(2)AlC from first principles
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
2017 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 19, no 32, 21595-21603 p.Article in journal (Refereed) Published
Abstract [en]

We have calculated electronic, vibrational, and elastic properties of (Mo2/3Sc1/3)(2)AlC and (Mo2/3Y1/3)(2)AlC, two recently discovered nanolaminated materials in the family of so-called i-MAX phases. A comparison is made to the properties of the related hypothetical MAX phases Sc2AlC, Y2AlC, and Mo2AlC. From an analysis of the electronic band structures and projected crystal orbital Hamilton populations (pCOHP), we show that the i-MAX phases have more isotropic band structures than the MAX phases, but that their bonding characteristics are very similar, despite belonging to different space groups. However, the similar bonding notwithstanding, qualitative as well as significant quantitative differences are seen in the phonon density of states (PDOS). We also compare the Voigt-Reuss-Hill (VRH) bulk, shear, and Youngs moduli. For (Mo2/3Sc1/3)(2)AlC, BVRH = 132 GPa, GVRH = 89 GPa, and EVRH = 218 GPa, all of which are higher values than for Sc2AlC, but lower than for Mo2AlC. For (Mo2/3Y1/3)(2)AlC, BVRH = 117 GPa, GVRH = 85 GPa, and E-VRH = 205 GPa, which are higher than for Y2AlC, but lower than for Mo2AlC.

Place, publisher, year, edition, pages
ROYAL SOC CHEMISTRY , 2017. Vol. 19, no 32, 21595-21603 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-140508DOI: 10.1039/c7cp03228eISI: 000407765900043PubMedID: 28766605OAI: oai:DiVA.org:liu-140508DiVA: diva2:1140140
Note

Funding Agencies|Swedish Research Council (VR) [642-2013-8020]; Knut and Alice Wallenberg (KAW) Foundation [KAW 2015.0043]; SSF synergy grant FUNCASE

Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2017-09-11

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