Abstract:
: Three high-entropy Sm(Eu,Gd)Cr0.2Mn0.2Fe0.2Co0.2Ni0.2O3 perovskite solid solutions were
synthesized using the usual ceramic technology. The XRD investigation at room temperature established a single-phase perovskite product. The Rietveld refinement with the FullProf computer
program in the frame of the orthorhombic Pnma (No 62) space group was realized. Along with a
decrease in the V unit cell volume from ~224.33 Å3
for the Sm-based sample down to ~221.52 Å3
for the Gd-based sample, an opposite tendency was observed for the unit cell parameters as the
ordinal number of the rare-earth cation increased. The average grain size was in the range of 5–8 µm.
Field magnetization was measured up to 30 kOe at 50 K and 300 K. The law of approach to saturation was used to determine the Ms spontaneous magnetization that nonlinearly increased from
~1.89 emu/g (Sm) up to ~17.49 emu/g (Gd) and from ~0.59 emu/g (Sm) up to ~3.16 emu/g (Gd)
at 50 K and 300 K, respectively. The Mr residual magnetization and Hc coercive force were also
determined, while the SQR loop squareness, k magnetic crystallographic anisotropy coefficient,
and Ha anisotropy field were calculated. Temperature magnetization was measured in a field of
30 kOe. ZFC and FC magnetization curves were fixed in a field of 100 Oe. It was discovered that
the Tmo magnetic ordering temperature downward-curve decreased from ~137.98 K (Sm) down
to ~133.99 K (Gd). The spin glass state with ferromagnetic nanoinclusions for all the samples was
observed. The <D> average and Dmax maximum diameter of ferromagnetic nanoinclusions were
calculated and they were in the range of 40–50 nm and 160–180 nm, respectively. The mechanism
of magnetic state formation is discussed in terms of the effects of the A-site cation size and B-site
poly-substitution on the indirect superexchange interactions.
