Magnetic properties of Ln2.1Co16.9Si alloys
Chem.
Met. Alloys 1
(2008) 34-37
https://doi.org/10.30970/cma1.0002
W. SUSKI, R. GLADYSHEVSKII, N. VITYK, A. GILEWSKI, T. MYDLARZ, K. WOCHOWSKI
Following up a study of stoichiometric
compounds Ln2Co16Si, we report here
magnetic properties of off-stoichiometric Ln2.1Co16.9Si
alloys, where Ln = La, Ce,
Pr, Sm, and
Gd. All the
investigated compounds were found to
crystallize with the rhombohedral Th2Zn17
type, except the off-stoichiometric Ce compound, which,
contrary to the Ce2Co16Si alloy,
was found to adopt the
hexagonal Th2Ni17 type under the
experimental conditions. The magnetic properties
of polycrystalline samples were investigated
in the temperature
range 1.9-1100 K in various magnetic fields. The field
dependence of the magnetization was studied at
T = 1.9 and 4.2 K. As for the stoichiometric
compounds, saturation was observed in
relatively low magnetic fields. The temperature dependence of the
magnetization was measured in a field
of 50 Oe between 1.9 and 400 K, and in a magnetic
field of 4.83 kOe in the
temperature range 300-1100
K. The Curie points of the
off-stoichiometric compounds
are below 1000 K and do thus
not reach those of their
stoichiometric homologues. The highest value
was observed for the La
alloy, indicating competition between the magnetic moments
of the Co
and lanthanide sublattices.
Magnetization vs. temperature for Ln2.1Co16.9Si
alloys.
Keywords
Ternary rare-earth silicides / Magnetic properties / Magnetic phase transition / High-magnetic field measurements