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Magnetic properties of Cr2AlB2, Cr3AlB4, and CrB powders
Journal article   Open access   Peer reviewed

Magnetic properties of Cr2AlB2, Cr3AlB4, and CrB powders

Sankalp Kota, Wenzhen Wang, Jun Lu, Varun Natu, Christine Opagiste, Guobing Ying, Lars Hultman, Steven J. May and Michel W. Barsoum
Journal of alloys and compounds, v 767, pp 474-482
30 Oct 2018
DOI: https://doi.org/10.1016/j.jallcom.2018.07.031
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https://doi.org/10.1016/j.jallcom.2018.07.031View
Accepted (AM)Maybe Open Access (Publisher Bronze),  Open

Abstract

Borides MAB phases Magnetic properties Nanolayered structure Paramagnetism
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 Fe2AlB2 have been well-studied experimentally, but those of most end member MAB phases with other transition metals remain poorly understood. Herein, predominantly single-phase Cr3AlB4 and Cr2AlB2 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 Cr3AlB4, Cr2AlB2 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. •Cr2AlB2 and Cr3AlB4 are synthesized as predominantly single-phase powders.•Magnetization and heat capacity studies suggest Pauli-like paramagnetic behavior.•STEM imaging shows atomic structure and defects in Cr3AlB4 for the first time.

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Domestic collaboration
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Chemistry, Physical
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
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