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AlM2B2 (M = Cr, Mn, Fe, Co, Ni): a group of nanolaminated materials
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics.ORCID iD: 0000-0003-0210-4340
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2017 (English)In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 29, no 15, article id 155402Article in journal (Refereed) Published
Abstract [en]

Combining theory with experiments, we study the phase stability, elastic properties, electronic structure and hardness of layered ternary borides AlCr2B2, AlMn2B2, AlFe2B2, AlCo2B2, and AlNi2B2. We find that the first three borides of this series are stable phases, while AlCo2B2 and AlNi2B2 are metastable. We show that the elasticity increases in the boride series, and predict that AlCr2B2, AlMn2B2, and AlFe2B2 are more brittle, while AlCo2B2 and AlNi2B2 are more ductile. We propose that the elasticity of AlFe2B2 can be improved by alloying it with cobalt or nickel, or a combination of them. We present evidence that these ternary borides represent nanolaminated systems. Based on SEM measurements, we demonstrate that they exhibit the delamination phenomena, which leads to a reduced hardness compared to transition metal mono-and diborides. We discuss the background of delamination by analyzing chemical bonding and theoretical work of separation in these borides.

Place, publisher, year, edition, pages
Institute of Physics Publishing (IOPP), 2017. Vol. 29, no 15, article id 155402
Keywords [en]
nanolaminated ternary borides, phase stability, elastic constants, hardness, scanning electron microscopy
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-205430DOI: 10.1088/1361-648X/aa602aISI: 000397921600002PubMedID: 28192279Scopus ID: 2-s2.0-85015870039OAI: oai:DiVA.org:kth-205430DiVA, id: diva2:1097214
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QC 20170522

Available from: 2017-05-22 Created: 2017-05-22 Last updated: 2017-05-22Bibliographically approved

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Hellsvik, Johan

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