Magnetic and mechanical effects of Mn substitutions in AlFe 2 B 2
Artikel i vetenskaplig tidskrift, 2019

The mechanical and magnetic properties of the newly discovered MAB-phase class of materials based upon AlFe 2 B 2 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 AlFe 2 B 2 . 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 AlFe 2 B 2 with manganese, the magnetism in the system goes from being ferro- to antiferromagnetic via a disordered ferrimagnetic phase exhibited by AlFeMnB 2 . Density functional theory calculations indicate a weakening of the magnetic interactions among the transitions metal ions as iron is substituted by manganese in AlFe 2 B 2 . The Mn-Mn exchange interactions in AlMn 2 B 2 are found to be very small.

Magnetism

Mechanical properties

Magnetocaloric materials

Density functional theory

X-ray diffraction

Författare

J. Cedervall

Uppsala universitet

M. S. Andersson

Uppsala universitet

Chalmers, Kemi och kemiteknik

Diana Iuşan

Uppsala universitet

Erna K. Delczeg-Czirjak

Uppsala universitet

U. Jansson

Uppsala universitet

P. Nordblad

Uppsala universitet

M. Sahlberg

Uppsala universitet

Journal of Magnetism and Magnetic Materials

0304-8853 (ISSN)

Vol. 482 54-60

Ämneskategorier

Oorganisk kemi

Materialkemi

Den kondenserade materiens fysik

DOI

10.1016/j.jmmm.2019.03.046

Mer information

Senast uppdaterat

2019-07-21