Magnetic Properties of Yttrium-Substituted NiZn Ferrites

Abstract

Polycrystalline NiZn ferrite doped with a small amount of Y 3+ ions and having the composition of Ni0.42Zn0.58YxFe2−xO4, where x = 0.00, 0.01, 0.02, 0.04, 0.06, 0.08 and 0.10, was analyzed. Specimens were prepared by the ceramic method. Thermo-magnetic analysis and evaluation of hysteresis loops parameters were chosen as main examination methods in this study. Various parameters, such as Curie temperature TC , coercive eld Hc, remanent magnetic ux density Br, hysteresis loop area and amplitude/initial permeability were studied at low frequencies.

Yttrium-substituted Mg–Zn ferrites: correlation of physical properties with Yttrium content

“…Mg-Zn ferrites decreases with increasing Y contents unlike for x = 0.01 that is expected and consistent with reported Ho substituted Ni-Zn ferrites for x = 0.015 [57] and x = 0.01 [58]. When Y ions are added into Mg-Zn ferrites, the Y ions substitute the Fe 3+ ions at the B-site in the compositions [13]. At the same time, some of Zn ions loss compensated by pushing some Fe 3+ at the A-site.…”

“…Therefore, increase of electrical resistivity is expected by Y 3+ substitution for Fe 3+ in Mg-Zn ferrites due to its (Y 3+ ) tendency to occupy the B-site due to larger ionic radius [13]. It is noted that the Yttrium (Y) has already been substituted in Ni-Zn 3 ferrites, Mg ferrites and Co ferrites [13][14][15][16][17][18][19][20]. Enhancement of electrical resistivity in Y substituted Ni-Zn and Mg ferrites have also been reported [16][17][18].…”

“…It is well known that the rare-earth ions occupy the octahedral (B) sites that reduced the electron hopping by limiting the motion of Fe 2+ , results an increase in resistivity [12]. Therefore, increase of electrical resistivity is expected by Y 3+ substitution for Fe 3+ in Mg-Zn ferrites due to its (Y 3+ ) tendency to occupy the B-site due to larger ionic radius [13]. It is noted that the Yttrium (Y) has already been substituted in Ni-Zn ferrites, Mg ferrites and Co ferrites [13][14][15][16][17][18][19][20].…”

Magnetic properties of Sn-substituted Ni–Zn ferrites synthesized from nano-sized powders of NiO, ZnO, Fe 2 O 3 , and SnO 2

“…The properties of Ni-Zn ferrites can be tailored by altering chemical composition, preparation methods, sintering temperature (T s ) and impurity element or levels and the reports regarding these issues are available in the literatures . Recently, many researchers reported the structural, magnetic and electrical properties of Ni-Zn ferrite and/or substituted Ni-Zn ferrites in bulk [6,12,13,[19][20][21][26][27][28] and nano forms [16,[22][23][24].…”

Magnetic Properties of Ni_{0.3}Zn_{0.7}Fe_2O_4 Ferrites with Iron Ions Partly Substituted by Europium

“…For this reason Eu was chosen as the substituent, since some other our studies proved Eu (along with Gd and La) as a good agent important for the increase of the Curie temperature, in case of Eu even linear with increase of substituting amount x, see e.g. [3,6].…”