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Nickel Ferrite Nanocrystallites Synthesized by Sol-Gel …

6 Bhise RB, Rathod SM, Supekar AK. Magnetic, Electric and Structural Properties of Ni Substituted Co-Zn Ferrite Nanoparticles Synthesized by Sol-Gel Method. Journal of Applied Physics 2012;2(4):7-12. [ ]

Keywords Microwave; combustion synthesis; nickel ferrite; cobalt ferrite; nanoparticles

22 Hankare PP, Sanadi KR, Garadkar KM, Patil DR, Mulla IS. Synthesis and characterization of nickel substituted cobalt ferrite nanoparticles by sol-gel auto-combustion method. Journal of Alloys and Compounds2013;553:383-388. [ ]

Nickel Ferrite: Combustion Synthesis, Characterization …

Smelting to ferronickel is essentially the same as matte smelting, except that no sulfur is added.

Polycrystalline nickel-doped cobalt ferrites (NixCo1-xFe2O4), where x = 0.0, 0.25, 0.50, 0.75 and 1.0 of Ni2+, were synthesized by the microwave combustion synthesis method. The high purity precursors used in these reactions were: Fe(NO3)3.9H2O (Merck), Co(NO3)2.6H2O (Merck), and Ni(NO3)2.6H2O (Merck) as oxidant and source of cations, while urea [CO(NH2)2] (Merck) was used as a reducing agent. The synthesis process began by determining the initial mixing ratio of the precursors. Stoichiometric amounts of metal nitrates were dissolved in an aqueous solution of urea, calculated based on the valences of the reactive elements to reach an oxidizer to fuel ratio =1, based on the pre-established stoichiometry of the metal ions to form the phases of interest. The precursors were weighed and placed in vitreous silica crucibles, and the desired ratio was obtained by adding 10 ml of distilled water. The aqueous mixtures were stirred with a magnetic stirrer to homogenize the solution. The combustion reactions were performed in a domestic microwave oven operating at a maximum power of 980 W for 5 min at a frequency of 2.45 GHz. The solution initially boils and then dehydrates, subsequently decomposing and producing large amounts of gas. When the material reaches the point of spontaneous combustion it begins to burn and releases a large amount of heat, vaporizing the solution instantly and turning into a solid, thus forming the desired phase. Experimental measurements of the burning time of the reactions were performed using a CONDOR digital stopwatch. The conventional combustion synthesis takes about 8 min for each reaction.

The crystal structure of the powder material was analyzed by X-ray diffraction and the resulting XRD pattern of the as-prepared sample is shown in . The analysis of the diffraction pattern, based on (220) (310) (311) (222) (400) (333), (511) and (440) reflection planes, confirmed the formation of a cubic structure. In this figure, note the presence of well-defined peaks of the major phase of Ni1-xCoxFe2O4 with good diffraction line broadening, indicating the formation of highly crystalline powders and the complete formation of the Ni-Co ferrite phase. The uniform heating provided by the microwave oven enabled the entire combustion reaction to produce NixCo1-xFe2O4 to be completed in only few minutes. The XRD patterns reveal a slight shift in the position of the peaks to smaller interplanar spacing "d" with increasing concentrations of nickel. The interplanar spacing d (Å) was calculated using Bragg's law. No secondary phase was detected by XRD, thus confirming the purity of the phase of the final product. The microwave combustion reaction time of each composition was approximately 2 min.

Nickel ferrite nanoparticles: elaboration in polyol …

The room temperature magnetization of NixCo1-xFe2O4 nanoparticles with different Ni contents (x = 0.0, 0.25, 0.5, 0.75, 1.0) was measured with a vibrating sample magnetometer (VSM) and the resulting M-H curves are shown in . Note that the curves of the MxH samples show hysteresis corresponding to each composition. As can be seen in , the samples exhibit a particle size in the range of 30 to 50 nm, with all the samples presenting a different coercive field and saturation magnetization (Ms) of the cobalt ferrite, and in both case decreased as the concentration of nickel in the composition increased.

Cobalt ferrite (CoFe2O4) is a well-known hard magnetic material with high coercivity and moderate magnetization, which is useful in high-density digital recording discs and audio/videotape. However, CoFe2O4 has a high magnetocrystalline anisotropy, which makes it difficult to achieve high initial susceptibility or magnetic conductivity. While nickel ferrite (NiFe2O4) is a typical soft magnetic material with lower magnetocrystalline anisotropy,, it provides an effective way to reduce the anisotropy of CoFe2O4 by partly substituting Co2+ for Ni2+, NixCo1−xFe2O4. In view of the above, a new type of nanocomposite, NixCo1−xFe2O4, which has controllable magnetic properties, is expected to be used in electromagnetic and nanotechnology applications. The goal of this study is to synthesize nanocrystalline NixCo1-xFe2O4 (where x = 0.0, 0.25, 0.50, 0.75, 1.0) by an alternative and relatively new microwave assisted combustion reaction method, using urea as fuel, and to investigate its structural and magnetic properties.

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Ultrafine magnetic nickel ferrite NiFe 2 O 4 ..

14 Eerenstein W, Wiora M, Prieto JL, Scott JF, Mathur ND. Giant sharp and persistent converse magnetoelectric effects in multiferroic epitaxial heterostructures. Nature Materials 2007;6(5):348-351. [ ]

Synthesis and characterization of Nickel Copper Ferrite

10 Fu YP, Pan KY, Lin CH. Microwave-induced combustion synthesis of Ni0.25Cu0.25Zn0.5 ferrite powders and their characterizations. Materials Letters 2002;57(2):291-296. [ ]

Nanoparticles, Nickel ferrite, Synthesis",

23 Zalite I, Heidemane G, Kodols M, Grabis J, Maiorov M. The synthesis, characterization and sintering of nickel cobalt ferrite nanopowders. Materials Science2012;18(1):1392-1320. [ ]

Nanocrystalline Manganese Substituted Nickel Ferrite …

9 Costa ACFM, Tortella E, Morelli MR, Kiminami RHGA. Synthesis, microstructure and magnetic properties of Ni-Zn ferrites. Journal of Magnetism and Magnetic Materials 2003;256(1-3):174-182. [ ]

is the molecular weight of nickel ferrite, ..

8 YP Fu, CH Lin. Microwave-induced combustion synthesis of Ni-Zn ferrite powder and its characterization. Journal of Magnetism and Magnetic Materials2002;251(1):74-79. [ ]

Nano Nickel-Cobalt Ferrite Catalyzed one Pot Synthesis …

24 Singhal S, Singh J, Barthwal SK, Chandra K. Preparation and characterization of nanosize nickel-substituted cobalt ferrites (Co1-xNixFe2O4). Journal of Solid State Chemistry2005;178(10):3183-3189. [ ]

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