Structural and magnetic properties of CoxZn1−xFe2O4 nanocrystals synthesized by microwave method

Köseoğlu, Yüksel; Baykal, A.; Gözüak, Fatma; Kavas, H.

doi:10.1016/j.poly.2009.06.061

Cited by 222 publications

(71 citation statements)

References 50 publications

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“…SEM micrographs for x = 0.20 shown in Figs. 4(a)-4(b) indicate that particles are uniformly distributed while agglomerates are also observed frequently like the other researchers reported about ferrites [18,24]. Figure 4(b) shows surface morphology at minimum resolution and gives direct information about porosity of material, while it can roughly be estimated from micro- graph at maximum resolution in Fig.…”

Section: Morphological Studiessupporting

confidence: 62%

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Faraz

2011

J Supercond Nov Magn

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The complex Mg-Cu nanoferrites with composition Mg 0.5 Cu 0.5 Fe 2−2x Ni x Zr x O 4 (0.00 ≤ x ≤ 0.80) were synthesized by incorporating dopants Zr 4+ and Ni 2+ with the help of chemical co-precipitation method. The synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), dc electrical and magnetic properties through laboratory-made two-probe resistivity apparatus and vibrating sample magnetometer (VSM). XRD confirmed the formation of single phase spinel nanoferrites having crystalline size in range 16-29 nm. The particle size (t) and lattice parameter (a) increase with the increase in concentration of dopants. The XRD results are in good agreement with SEM results. FTIR give valuable information about the presence of tetrahedral (A) and octahedral (B) sites by considering higher and lower frequency bands, respectively. The electrical properties, e.g. dc electrical resistivity (ρ d ), drift mobility (μ d ) and activation energy (E), were calculated. Resistivity data confirm semiconducting behavior of material. And it is observed that an abrupt increase in resistivity occurs up to x = 0.40. While further increase in dopants concentration leads to decrease in resistivity. Magnetic hysteresis loops confirmed soft nature of synthesized material. Interesting magnetic behavior is observed that up to x = 0.40 the value of saturation magnetization (M s ), remanence (M r ) and Bohr magneton (n B ) increase and after that decrease in trend occurs. For x = 0.40, minimum coercive force (H c ) is observed. Y-K angle increases with increase in dopant concentration. So it is confirmed that A. Faraz ( ) Thermal Transport Laboratory (TTL), School of chemical and materials Engineering (the incorporation of dopant in small amount (x ≤ 0.40) enhances magnetic properties and further increase of Zr 4+ can weaken magnetic properties.

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Section: Morphological Studiessupporting

confidence: 62%

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Faraz

2011

J Supercond Nov Magn

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“…The splitting in the absorption band at approximately 400 cm -1 suggests the occupancy of B sites by Mg 2+ ions [15]. The absorption band at approximately 3450 cm -1 indicates the presence of adsorbed water on the surface of the ferrite nanocrystals [16]. The band at approximately 2350 cm -1 is attributed to the presence of small traces of the carbonyl group [17].…”

Section: Ftir Absorption Studiesmentioning

confidence: 99%

Structural and magnetic studies of Mg(1−x)ZnxFe2O4 nanoparticles prepared by a solution combustion method

Choodamani¹,

Nagabhushana²,

Ashoka³

et al. 2013

Journal of Alloys and Compounds

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“…In addition to these, they exhibit ferrimagnetism, originating from the magnetic moment of anti-parallel spins between Fe 3+ ions at tetrahedral sites and Co 2+ or Ni 2+ ions at octahedral sites. 1 Due to the magnetic properties, ferrite have various applications in numerous fields including microwave devices, 2 recording media, 3 magnetic fluids, 4 gas sensors, 5 high density information storage, 6 ferro-fluids 7 and catalysts. 8 Literature contains several physical as well as chemical method to synthesize the spinel ferrites like solid-state reaction, 9 high energy ball milling, 10 sol-gel, 11 hydrothermal synthesis, 12 chemicalcoprecipitation, 13 combustion synthesis, 14 micro-emulsion 15 and microwave hydrothermal.…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

et al. 2015

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Microstructure and magnetic properties of MFe 2 O 4 (M = Co, Ni, and Mn) ferrite nanocrystals prepared using colloid mill and hydrothermal method Journal of Applied Physics 117, 17A328 (2015) Nickel substituted cobalt ferrite nanoparticles with composition Co 1−x Ni x Fe 2 O 4 (0.0≤x≤1.0) was synthesized using simple, low temperature auto combustion method. The X-ray diffraction patterns reveal the formation of cubic phase spinel structure. The crystallite size varies from 30-44 nm with the nickel content. Porous and agglomerated morphology of the bulk sample was displayed in the scanning electron microscopy. Micro Raman spectroscopy reveals continuous shift of E g and E g (2) stokes line up to 0.8 Ni substitution. The dispersion behavior of the dielectric constant with frequency and the semicircle nature of the impedance spectra show the cobalt nickel ferrite to have high resistance. The ferromagnetic nature is observed in all the samples, however, the maximum saturation magnetization was achieved by the 0.4 Ni substituted cobalt ferrite, which is up to the 92.87 emu/gm at 30K. C 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License. [http://dx

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Structural and magnetic properties of CoxZn1−xFe2O4 nanocrystals synthesized by microwave method

Cited by 222 publications

References 50 publications

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Effect of Concentration of Zr4+ and Ni2+ Dopants on Electrical, Magnetic and Y–K Angle of Mg–Cu Complex Spinel Nanoferrites

Structural and magnetic studies of Mg(1−x)ZnxFe2O4 nanoparticles prepared by a solution combustion method

Structural, dielectric and magnetic properties of nickel substituted cobalt ferrite nanoparticles: Effect of nickel concentration

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