Synthesis and Magnetic Properties of (Zn²⁺Ti⁴⁺) Substituted W-type and Y-type Ferrites

Abstract

We report the synthesis of (Zn 2+ Ti 4+ ) substituted hexagonal ferrites, BaZn2(Zn0.5Ti0.5)xFe16-xO27 (W-type) and Ba2Zn2(Zn0.5Ti0.5)xFe12-xO22 (Y-type), and the relationship between their composition and magnetic properties. Substituted W-type ferrite was synthesized in the region of 0.0 ≤ x ≤ 1.5. A decrease in the Curie temperature of the W-type phase indicated that the exchange interactions between the Fe 3+ ions weakened due to the substitution of Zn 2+ and Ti 4+ ions. Spontaneous magnetization (σS) at x = 0.5 was similar to that at x = 0.0. This reflects the equal distribution of nonmagnetic Zn 2+ and Ti 4+ ions to spin down sites and spin up sites, respectively. At x > 0.5, σS decreased clearly, which was possibly caused by a deviation from the collinear arrangement. Substituted Y-type ferrite was also obtained up to x = 0.5. The Y-type phase is more unstable than the W-type phase with respect to this substitution rate.

Analysis of Crystallography Structure and Magnetic Properties of Microwave Absorbing Material Ba_0.6Sr_0.4Fe_12-3xZn_2xTi_xO₁₉ (<i>X</i> = 0, 0.2, 0.4, and 0.6)

“…This can be explained by the substitution of Zn 2+ and Ti 4+ ions which are non-magnetic in the magnetic Fe 3+ ions which will reduce their magnetic properties. The same results were obtained by Vaishali V. Soman et al [12] and also K. Watanabe et al [13]. The low magnetic value is also caused by the high heating temperature [6].…”