Cation distribution correlated with magnetic properties of nanocrystalline gadolinium substituted nickel ferrite

Heiba, Zein K.; Mohamed, Mohamed Bakr; Arda, L.; Doǧan, N.

doi:10.1016/j.jmmm.2015.05.003

Cited by 76 publications

(19 citation statements)

References 34 publications

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“…It is observed that the peaks analogous to diffraction planes [ [12,13]. Figure 3 shows shift in XRD peaks towards left hand side with increasing concentration of Er +3 ions in CoFe 2 O 4 particles in concurrence with 'a' value.…”

Section: Ferritementioning

confidence: 64%

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Sumalatha¹,

Ravinder²,

Maramu³

et al. 2021

Ferrites - Synthesis and Applications

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Synthesis of Cobalt-Erbium nano-ferrites with formulation CoErxFe2-xO4 (x = 0, 0.005, 0.010, 0.015, 0.020, 0.025, and 0.030) using technique of citrate-gel auto-combustion was done. Characterization of prepared powders was done by using XRD, EDAX, FESEM, AFM and FTIR Spectroscopy, DC resistivity properties respectively. XRD Rietveld Analysis, SEM, TEM and EDAX analysis were taken up in studying spectral, structural, magnetic and electrical properties. XRD pattern of CEF nano particles confirm single phase cubic spinal structure. The structural variables given by lattice constant (a), lattice volume (v), average crystallite size (D) and X-ray density(dx), Bulk density (d), porosity (p), percentage of pore space (P%), surface area (s), strain (ε), dislocation density (δ), along with ionic radii, bond length and hoping length were calculated. SEM and TEM results reveal homogeneous nature of particles accompanied by clusters having no impurity pickup. TEM analysis gives information about particle size of nanocrystalline ferrite while EDAX analysis confirm elemental composition. Emergence of two arch shaped frequency bands (ν1 and ν2) that represent vibrations at tetrahedral site (A) and octahedral site(B) was indicated by spectra of FTIR. The samples electrical resistivity (DC) was measured between 30°C -600°C with Two probe method. XRD Rietveld analysis confirm crystallite size lying between 20.84 nm–14.40 nm while SEM analysis indicate formation of agglomerates and TEM analysis indicate particle size ranging between 24 nm–16 nm. DC Electrical measurements indicate continuous decrease in resistivity with increasing temperature while increasing doping decreases curie temperature. The Magnetic parameters such as Saturation magnetization (Ms), Remanent magnetization (Mr), Coercivity (Hc) and Squareness ratio (R = Mr/Ms), Magnetic moment (nB) were altered by doping of Er+3 content in the increasing order (x = 0.00 to 0.030). The increasing erbium content decreases magnetization thus converting the sample into soft magnetic material. Observations indicated strong dependence of magnetic properties on Erbium substitution and coercivity varies in accordance with anisotropy constant. Due to the presence of magnetic dipole Erbium substituted cobalt ferrites can be used in electromagnetic applications. The present study investigates the effect of different compositions of Er3+ replaced for Fe on structural properties and electrical resistivity of cobalt ferrites.

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Section: Ferritementioning

confidence: 64%

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Sumalatha¹,

Ravinder²,

Maramu³

et al. 2021

Ferrites - Synthesis and Applications

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“…The lattice constant of the fuel deposits formed under the no-zinc condition was 8.396 Å. The lattice constant of spinel NiFe 2 O 4 has been reported to be in the range of 8.33~8.35 Å [ 42 , 43 , 44 , 45 ]. Therefore, the lattice constant of the deposits is somewhat larger than that of NiFe 2 O 4 .…”

Section: Resultsmentioning

confidence: 99%

“…Unfortunately, we could not obtain the Gibbs free energy for this reaction because of the absence of the thermodynamic data for Ni(ZnFe)O 4 at high temperatures. Nickel ferrite has an inverse spinel structure [ 42 , 43 , 44 , 45 ]. To incorporate zinc cations into the pre-formed deposits, metal cations positioned in the spinel lattice sites should first be dissolved out from the sites into the coolant, and then, zinc cations in the coolant enter the resultant vacant sites.…”

Section: Resultsmentioning

confidence: 99%

Behavior of Zinc Incorporation into Fuel Deposits in Borated and Lithiated Water with Dissolved Zinc

et al. 2020

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The objective of this study was to investigate the behavior of zinc incorporation into newly forming fuel deposits and pre-formed deposits in a simulated pressurized water reactor coolant including 1000 ppm of boron and 2 ppm of lithium at 328 °C. Zinc was incorporated into fuel deposits that were being newly nucleated and grown on nuclear fuel cladding tubes in a zinc-containing coolant. The zinc incorporation resulted in a decrease in the lattice constant of the deposits, which was attributed to the decrease in larger iron content and the corresponding incorporation of smaller zinc in the deposits. However, zinc incorporation was not found, even after the fuel deposits pre-formed before zinc addition were subsequently exposed to the 60 ppb of zinc coolant for 500 h.

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“…Nature of the dopant can also influence the ultimate magnetic and electrical characteristics [10] [11]. Ionic radius and valiancy of the substituted ion also affect the alteration of these magnetic properties along with its site of preference [12] [13] [14]. Ti doped Ni-Cu-Zn ferrites are quite important in the field of microwave industry which is a mixture of NiFe 2 O 4 , ZnFe 2 O 4 , CuFe 2 O 4 with long range ferromagnetic ordering.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti4+ Doping on Structural, Electrical and Magnetic Properties of Ni0.4Cu0.2Zn0.4Fe2-xTixO4 Ferrites

Mazumdar¹,

Alam²,

Tanni³

et al. 2019

MSA

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Ti 4+ doped Ni 0.4 Cu 0.2 Zn 0.4 Fe 2−x Ti x O 4 (x = 0.0, 0.02, 0.05, 0.07, 0.10) chemical compositions are prepared by conventional solid state reaction technique. The ferrite phase formation has been confirmed from the pattern of XRD. The theoretical density (ρ th), bulk density (ρ B), and porosity are calculated from the XRD data and using approximate formulas. Value of ρ th is found to be greater than the value of ρ B indicating the formation of pores inside the bulk specimens. The micro-structural investigation has been done using Field Emission Scanning Electron Microscope and it is found that the average grain size reduces with the increase of Ti content. Saturation magnetization (M s) also reduces with the increase of Ti content, contrarily remanent magnetization (M r) and coercivity (H c) increases with the concentration of Ti in the composition due to the pinning effect. The real part of the initial permeability is found to be maximum for the x = 0.02 sample which could be due to the homogeneity and high density of the sample. For increasing frequency, the dielectric constant and dielectric loss are observed to decrease.

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Cation distribution correlated with magnetic properties of nanocrystalline gadolinium substituted nickel ferrite

Cited by 76 publications

References 34 publications

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Behavior of Zinc Incorporation into Fuel Deposits in Borated and Lithiated Water with Dissolved Zinc

Effect of Ti<sup>4+</sup> Doping on Structural, Electrical and Magnetic Properties of Ni<sub>0.4</sub>Cu<sub>0.2</sub>Zn<sub>0.4</sub>Fe<sub>2-x</sub>Ti<sub>x</sub>O<sub>4</sub> Ferrites

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Cation distribution correlated with magnetic properties of nanocrystalline gadolinium substituted nickel ferrite

Cited by 76 publications

References 34 publications

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Crystal Chemistry, Rietveld Analysis, Structural and Electrical Properties of Cobalt-Erbium Nano-Ferrites

Behavior of Zinc Incorporation into Fuel Deposits in Borated and Lithiated Water with Dissolved Zinc

Effect of Ti&lt;sup&gt;4+&lt;/sup&gt; Doping on Structural, Electrical and Magnetic Properties of Ni&lt;sub&gt;0.4&lt;/sub&gt;Cu&lt;sub&gt;0.2&lt;/sub&gt;Zn&lt;sub&gt;0.4&lt;/sub&gt;Fe&lt;sub&gt;2-x&lt;/sub&gt;Ti&lt;sub&gt;x&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; Ferrites

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Effect of Ti<sup>4+</sup> Doping on Structural, Electrical and Magnetic Properties of Ni<sub>0.4</sub>Cu<sub>0.2</sub>Zn<sub>0.4</sub>Fe<sub>2-x</sub>Ti<sub>x</sub>O<sub>4</sub> Ferrites