Synthesis and Magnetic Properties of Zn, Co and Ni Substituted Manganese Ferrite Powders by Sol-gel Method

Abstract

The Zn, Co and Ni substituted manganese ferrite powders, Mn 1-x (Zn, Co, Ni) x Fe 2 O 4 , were fabricated by the solgel method, and their crystallographic and magnetic properties were studied. The Zn substituted manganese ferrite, Zn 0.2 Mn 0.8 Fe 2 O 4 , had a single spinel structure above 400 o C, and the size of the particles of the ferrite powder increased when the annealing temperature was increased. Above 500 o C, all the Mn 1-x (Zn, Co, Ni) x Fe 2 O 4 ferrite had a single spinel structure and the lattice constants decreased with an increasing substitution of Zn, Co, and Ni in Mn 1-x (Zn, Co, Ni) x Fe 2 O 4 . The Mössbauer spectra of Mn 1-x Zn x Fe 2 O 4 (0.0 ≤ x ≤ 0.4) could be fitted as the superposition of two Zeeman sextets due to the tetrahedral and octahedral sites of the Fe 3+ ions. For x = 0.6 and 0.8 they showed two Zeeman sextets and a single quadrupole doublet, which indicated they were ferrimagnetic and paramagnetic. And for x = 1.0 spectrum showed a doublet due to a paramagnetic phase. For the Co and Ni substituted manganese ferrite powders, all the Mössbauer spectra could be fitted as the superposition of two Zeeman sextets due to the tetrahedral and octahedral sites of the Fe 3+ ions. The variation of the Mössbauer parameters are also discussed with substituted Zn, Co and Ni ions. The increment of the saturation magnetization up to x = 0.6 in Mn 1-x Co x Fe 2 O 4 could be qualitatively explained using the site distribution and the spin magnetic moment of substituted ions. The saturation magnetization and coercivity of the Mn 1-x (Zn, Co, Ni) x Fe 2 O 4 (x = 0.4) ferrite powders were also compared with pure MnFe 2 O 4 .

Crystallographic and Magnetic Properties of Nickel Substituted Manganese Ferrites Synthesized by Sol-gel Method

“…It can provide multi-component oxides of homogeneous composition and has been used to prepare many high-purity oxide powders, including some with spinel-type structures. The sol-gel synthesis of substituted manganese ferrite is generally difficult, and there are a few detailed studies of Ni substituted manganese ferrites [5,6].…”

Surface Functionalization of MnFe2O4 Nanoparticles with Ethylenediamine for Hyperthermia Application

“…In addition, these particles must be small scale enough to maintain in the biological circulation and to transit via the capillary systems of tissues [9,10]. Magnetic nanoparticles can be prepared by various synthesis methods like co-precipitation, solgel, microwave, reverse micelle, ball milling, combustion, polyol and hydrothermal [11][12][13][14][15][16][17][18]. Here, polyol method was used to prepare ethylenediamine (EDA) functionalized MnFe2O4 nanoparticles.…”

Synthesis of α-Fe2O3 and Fe-Mn Oxide Foams with Highly Tunable Magnetic Properties by the Replication Method from Polyurethane Templates

“…More recently, MnFe 2 O 4 has emerged as a promising material to be used as a catalyst [ 25 , 26 ], in hydrogen production technologies [ 24 ] or for oil-water separation [ 7 ]. Diverse preparation techniques, such as high energy ball milling [ 24 , 27 ], co-precipitation [ 28 , 29 ] or sol-gel routes [ 30 ], have been used to obtain MnFe 2 O 4 powders and nanoparticles. However, the preparation of porous MnFe 2 O 4 remains challenging and rather elusive.…”

“…For instance, ultralight Fe 2 O 3 /C foams produced using polyelectrolyte-grafted PU sponges [ 7 ] exhibit one of the highest oil-absorption capacities among the reported counterparts. Magnetic Fe 3 O 4 nanoparticles/PU composites produced by in-situ blending methods have also been reported as good candidates for wastewater treatments, acting as carriers for immobilized microorganisms [ 30 ].…”