Structure and magnetic properties
of the (Cr,T,Ni)4Si phases, T = Fe, Ru, Pd
Chem.
Met. Alloys 14 (2021)
31-37
https://doi.org/10.30970/cma14.0417
Romana-Iryna
MARTYNIAK, Nataliya MUTS,
Matej BOBNAR, Lev AKSELRUD, Roman GLADYSHEVSKII
The π phase (Cr,T,Ni)4Si,
where T is Fe, Ru, or Pd,
crystallizing with an Au4Al-type structure (Pearson symbol cP20, space group P213), was synthesized in three alloys of the Cr26Fe9Ni47Si18,
Cr26Ru9Ni47Si18, and Cr26Pd9Ni47Si18
nominal compositions. The crystal structures of the (Cr,T,Ni)4Si
phases were refined from X‑ray powder diffraction data: cell parameter a = 0.612574(9) nm for (Cr0.32Fe0.11Ni0.57)4Si;
a = 0.614454(8) nm for
(Cr0.40Ru0.08Ni0.52)4Si; a = 0.61831(1) nm for (Cr0.33Pd0.11Ni0.56)4Si.
The temperature dependence of the magnetic susceptibility of the (Cr0.40Ru0.08Ni0.52)4Si
compound was studied in external magnetic fields of up to 7 T and in the
temperature range between 1.8 and 350 K. The Cr26Ru9Ni47Si18
alloy exhibits paramagnetic behavior governed by the modified Curie-Weiss law: χ0 = 172.7·10-6 emu g-at-1;
C = 3.7·10-3 emu g-at-1 K-1;
Θp = -34 K.
Projection of the structure of (Cr0.40Ru0.08Ni0.52)4Si
along [001] and coordination polyhedra of the three
sites.
Keywords
X-ray powder diffraction / Crystal structure /
βMn structure type family / Magnetic properties / Magnetic skyrmions