Single‐Phase MnFe₂O₄ Powders Obtained by the Polymerized Complex Method

Abstract

The present investigation reports on a simple technique for the preparation of single-phase MnFe 2 O 4 nanocrystalline powders using the polymerized complex method, starting from manganese carbonate and iron nitrate. A mixed aqueous solution with citric acid, ethylene glycol, Fe, and Mn ions was polymerized. The phases formation, the homogeneity, and the structure of the obtained powders have been investigated by thermogravimetry, X-ray diffraction (XRD), scanning and transmission electron microscopy, and Mo¨ssbauer spectroscopy measurements. The magnetic hysteresis loop behavior was measured at 5 K in a vibrating sample magnetometer. XRD results demonstrated that thermally induced crystallization of cubic MnFe 2 O 4 from the Mn-Fe polymeric precursor occurred at temperatures as low as 4001C.

Study of manganese ferrite powders prepared by a soft mechanochemical route

“…The hysteresis curve at low applied fields shows the values of the coercive field, H c ≈ 500 Oe and the remnant magnetization, M r ≈ 32 emu/g for sample obtained for 25 h of milling time from the mixture of (a) Mn(OH) 2 and Fe 2 O 3 and (b) Mn(OH) 2 and Fe(OH) 3 powders. The saturation magnetization measured on the MnFe 2 O 4 spinel ferrite nanopowder by a soft mechanochemical synthesis is higher than that for spinel ferrites produced by polymeric precursor [8]. The way we performed the extrapolation of results obtained by magnetic measurements at room temperature is the same as that which can be found in works by many authors [36][37][38].…”

“…Ferrites are often prepared by high-temperature solid-state reactions [8]. In the last decades, nanoferrites exhibiting novel properties have been prepared by a variety of methods such as co-precipitation [9], sol-gel [10], hydrothermal reactions [11,12], combustion synthesis [13,14] and high-energy milling [15][16][17][18][19][20].…”

Hydrothermal synthesis and characterizations of Ti substituted Mn-ferrites

“…Ferrite spinels (MFe 2 O 4 , M = Mn, Zn and Ni) are ideal for high-frequency passive components because of its high permeability, resistivity and permittivity. Manganese ferrite (MnFe 2 O 4 ) has received a great attention in the areas of magnetic storage devices, microwaves, and electronic devices because it has high magnetic permeability and high electrical resistivity [1][2][3][4][5][6][7][8]. The properties of ferrite materials are determined by their chemical composition, crystallite size and shape, which can be controlled by the preparation and processing parameters.…”

Low-Temperature Synthesis of Nanocrystalline Mn<sub>0.2</sub>Ni<sub>0.8</sub>Fe2O<sub>4</sub> by Oxalate Precursor Route

“…Spinel ferrite (soft ferrite) with the general formula MFe 2 O 4 , where M = Mn, Co, Ni, Cu or Zn or a mixture of these ions, posses unique electronic or physical structure and chemical stability [1,2]. It is an ideal material for high-frequency passive components because of its high permeability, resistivity and permitivity.…”

“…The Ni-Mn ferrite (Mn x Ni 1−x Fe 2 O 4 ) crystallizes in an inverse spinel structure and can be represented by (Mn x Fe 1−x ) A (Ni 1−x Fe 1+x ) B O 4 where x is defined as the inversion parameter and depends upon preparation conditions and heat treatment [1,[11][12][13][14][15][16][17][18]. Spinel nanocrystalline ferrite displays enhanced magnetic and electronic properties by virtue of their unique electronic or physical structure which may be harnessed for technological applications [2,4,19,20].…”