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arXiv · 1811.12720

Magnetic and mechanical effects of Mn substitutions in AlFe2B2

Johan Cedervall·Mikael S. Andersson·Diana Iusan·Erna K. Delczeg-Czirjak·Ulf Jansson·Per Nordblad·Martin Sahlberg
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Abstract

The mechanical and magnetic properties of the newly discovered MAB-phase class of materials based upon AlFe2B2 were investigated. The samples were synthesised from stoichiometric amounts of all constituent elements. X-ray diffraction shows that the main phase is orthorhombic with an elongated b-axis, similar to AlFe2B2. The low hardness and visual inspection of the samples after deformation indicate that these compounds are deformed via a delamination process. When substituting iron in AlFe2B2 with manganese, the magnetism in the system goes from being ferro- to antiferromagnetic via a disordered ferrimagnetic phase exhibited by AlFeMnB2. Density functional theory calculations indicate a weakening of the magnetic interactions among the transitions metal ions as iron is substituted by manganese in AlFe2B2. The Mn-Mn exchange interactions in AlMn2 B2 are found to be very small.

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Johan Cedervall, Mikael S. Andersson, Diana Iusan, Erna K. Delczeg-Czirjak, Ulf Jansson, Per Nordblad, Martin Sahlberg. 2018-11-30. Magnetic and mechanical effects of Mn substitutions in AlFe2B2. https://doi.org/10.1016/j.jmmm.2019.03.046

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