Ni-substitution effect on the properties of Ba0.5Sr1.5Zn2-xNixFe12O22 powders

Phase Transitions in Magneto-Electric Hexaferrites

“…Similar behavior was also observed for SrBaMg 2 Fe 12 O 22 and Sr 1.5 Ba 0.5 Mg 2 Fe 12 O 22 at room temperature, BaSrMg 2 Fe 11.48 Mn 0.52 O 22 at 5 K, and for Ba 0.5 Sr 1.5 Zn 2– x Ni x Fe 12 O 22 at 4.2 K Figure b presents the difference in the hysteresis loop behavior at 300 K in the weak magnetic fields range for a Ba 0.5 Sr 1.5 Zn 2 Al 0.08 Fe 11.92 O 22 sample obtained by sol–gel autocombustion; as seen, a triple hysteresis curve is not observed .…”

“…Differential ac susceptibility (real part χ′ and imaginary part χ″) as a function of the temperature for samples (a) Ba 0.5 Sr 1.5 Zn 1.2 Ni 0.8 Fe 12 O 22 , (b) Ba 0.5 Sr 1.5 ZnNiFe 12 O 22 , and (c) Ba 0.5 Sr 1.5 Zn 0.5 Ni 1.5 Fe 12 O 22 recorded in an ac magnetic field with an amplitude of 10 Oe and a frequency of 1000 Hz. Reprinted with permission from ref . Copyright 2020 Elsevier.…”

“…In ref , Koutzarova et al presented a study on the formation of Ni-doped Ba 2 Zn 2 Fe 12 O 22 . The synthesized specimens were a spinel-type Ni–Zn mixed ferrite (Zn,Ni)­Fe 2 O 4 with the crystallites size ranging from 10 to 12 nm.…”

“…The influence of the substitution of the magnetic cation (Ni 2+ ) with Zn 2+ , which is diamagnetic, on the magnetic phase transitions in Ba 0.5 Sr 1.5 Zn 2– x Ni x Fe 12 O 22 ( x = 0.8, 1, 1.5) powder was reported by Koutzarova et al Figure presents the temperature dependence of the differential susceptibility of Ba 0.5 Sr 1.5 Zn 2– x Ni x Fe 12 O 22 ( x = 0.8, 1, 1.5). The ac susceptibility’s real part rises with the temperature; however, a sharp rise is visible at about 225 K. We should stress here that no maximum of the real part of the ac susceptibility is seen at 300 K for the x = 0.8 composition, as opposed to the cases of the other two samples.…”

Effect of cation substitutions in Y-type Ba0.5Sr1.5Me2Fe12O22 hexaferrites on the magnetic phase transitions

“…The studies on the magnetic properties and magnetoelectric effect have been mainly focused on the Ba0.5Sr1.5Zn2Fe12O22 hexaferrite and on the effect of substituting Zn with other cations. The results of our previous works [8,9] on replacing the non-magnetic Zn 2+ with the magnetic Ni 2+ cations in Ba0.5Sr1.5Zn2-xNixFe12O22 demonstrated that a half substitution of Zn 2+ with Ni 2+ displaces the helical spin magnetic order to higher temperatures. Also, the electrical polarisation caused by a weak magnetic field in Ba2Mg2Fe12O22 has to do with the Mg 2+ cations reducing the magnetic anisotropy [10].…”