Synthesis, microstructure and magnetic properties of Ni–Zn ferrites

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

“…The presence of small grains can be attributed to no coarsened α-Fe 2 O 3 existing in the annealed samples obtained at this annealing temperature. Similar finding were previously obtained during the microstructure investigation of different ferrites [6,[33][34][35]. For the powder thermally treated at 800˚C (increase of annealing temperature), the ferrite powders possessed a uniform cubic structure with a crystalline microstructure as shown in Figure 6(b).…”

Microwave Assisted Combustion Synthesis and Characterization of Nanocrystalline Nickel-doped Cobalt Ferrites

“…To minimize the difficulties posed by the mixed oxide method, various methods of chemical synthesis have been used in the laboratory to obtain ferrites, mainly in order to control their microstructure and magnetic properties by controlling characteristics such as purity, chemical homogeneity, shape and mean particle size of powders [3][4][5][6] . In the past decade, the solution combustion method was widely used to synthesize single or mixed metal oxides [7][8][9][10][11][12] . Organic compounds (e.g., glycine, urea, citric acid, alanine and carbohydrazine) have been mixed directly with metal to increase the efficiency of the nitrate combustion synthesis method.…”

ZnFe2O4 Containing Nanoparticles: Synthesis and Magnetic Properties

“…Ferrites with nanocrystalline structure are technologically important materials because of their unique electric, dielectric, electronic, mechanic, magnetic, optical and catalytic properties. Mixed Me-Zn ferrites are characterized by good magnetic properties [1], low (for NiFe2O4) [2] or high (for CoFe2O4) [3] magnetic coercivity, high electrical resistivity and negligible eddy current loss for high-frequency electromagnetic wave propagation [2], chemical stability and fairly high mechanical hardness [4], low dielectric losses and high Curie temperature [5]. CoFe2O4 has high permeability in the radio frequency range [6], high thermal stability [7], moderate saturation magnetization [8] and electrical conductivity [9].…”

“…CoFe2O4 has high permeability in the radio frequency range [6], high thermal stability [7], moderate saturation magnetization [8] and electrical conductivity [9]. It makes them suitable for many technological applications -like microwave devices [10] and telecommunication applications, electric motors and generators, excellent core material for power transformers in electronics, antenna rods, loading coils and read/write heads for high speed digital tape [1], recording tapes and discs [8], high-density information storage and recording devices and as permanent magnets [10], sensors [11] etc. Magnetic nanoparticles and, in particular, magnetic fluids (ferrofluids) have been important for applications in biotechnology and biomedicine -biomedical drug delivery and as contrast agents [11], medical diagnostics [12].…”