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Magnetic properties of Cr2AlB2, Cr3AlB4, and CrB powders
Drexel Univ, PA 19104 USA.
Drexel Univ, PA 19104 USA.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
Drexel Univ, PA 19104 USA.
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2018 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 767, p. 474-482Article in journal (Refereed) Published
Abstract [en]

The MAB phases are ternary, atomically laminated compounds that crystallize with orthorhombic structures and consist of transition metal (M) boride sublattices interleaved with single or double layers of Al. To date, the magnetic properties of ferromagnetic Fe(2)AIB(2) have been well-studied experimentally, but those of most end member MAB phases with other transition metals remain poorly understood. Herein, predominantly single-phase Cr(3)AIB(4) and Cr(2)AIB(2) powders, with minor amounts of CrB impurities, were synthesized by heating mixtures of chromium monoboride (CrB), aluminum (Al), and boron or CrB and Al under flowing Ar. These reactants were found to substantially suppress the formation of undesired phases in the Cr-Al-B system. The magnetic properties of Cr(3)AIB(4), Cr(2)AIB(2) and CrB powders were characterized. All compounds exhibit paramagnetic behavior down to 4 K, with susceptibilities that are quite weakly temperature dependent at higher temperatures and a Curie-Weiss-like component prominent at low temperatures. Magnetization isotherms of the three compounds, showed approximately linear behavior above 5 kOe and no saturation of the magnetic moment up to 40 kOe, which is consistent with paramagnetism. The magnitude of the magnetic moments showed little variation with composition, on a per Cr atom basis. While the exact nature of the Curie-Weiss component is not entirely clear, we tentatively attribute it to dilute extrinsic impurities. (C) 2018 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE SA , 2018. Vol. 767, p. 474-482
Keywords [en]
MAB phases; Borides; Nanolayered structure; Magnetic properties; Paramagnetism
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-152051DOI: 10.1016/j.jallcom.2018.07.031ISI: 000446316500059OAI: oai:DiVA.org:liu-152051DiVA, id: diva2:1259449
Note

Funding Agencies|Army Research Office [W911NF-11-1-0283]; Knut and Alice Wallenberg Foundation [KAW 2008-0058, KAW-2015-0043, KAW-2006-0358]; Nanosciences Foundation (Universite Grenoble-Alpes Foundation)

Available from: 2018-10-29 Created: 2018-10-29 Last updated: 2018-10-29

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