ic7b02663_si_002.pdf (1.34 MB)
Influence of Cobalt Substitution on the Magnetic Properties of Fe5PB2
journal contribution
posted on 2018-01-03, 20:48 authored by Johan Cedervall, Elise Nonnet, Daniel Hedlund, Lennart Häggström, Tore Ericsson, Mirosław Werwiński, Alexander Edström, Ján Rusz, Peter Svedlindh, Klas Gunnarsson, Martin SahlbergThe substitutional
effects of cobalt in (Fe1–xCox)5PB2 have been studied
with respect to crystalline structure and
chemical order with X-ray diffraction and Mössbauer spectroscopy.
The magnetic properties have been determined from magnetic measurements,
and density functional theory calculations have been performed for
the magnetic properties of both the end compounds, as well as the
chemically disordered intermediate compounds. The crystal structure
of (Fe1–xCox)5PB2 is tetragonal (space group I4/mcm) with two different metal sites,
with a preference for cobalt atoms in the M(2) position (4c) at higher
cobalt contents. The substitution also affects the magnetic properties
with a decrease of the Curie temperature (TC) with increasing cobalt content, from 622 to 152 K for Fe5PB2 and (Fe0.3Co0.7)5PB2, respectively. Thus, the Curie temperature is dependent
on composition, and it is possible to tune TC to a temperature near room temperature, which is one prerequisite
for magnetic cooling materials.