Effect of Er substitution on the magnetic, Mössbauer spectroscopy and dielectric properties of CoFe2−xErxO4 (x = 0.00, 0.01, 0.03, 0.05) nanoparticles

Abdullah‐Al‐Mamun, Md.; Sarker, M.S.I.; Hasan, Mahmudul; Haque, Md. Mahmudul; Khan, F.A.; Rahman, M. M.; Khan, M.K.R.

doi:10.1016/j.rinp.2021.104698

Cited by 17 publications

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“…In order to compute r A and r B , the following cation distribution is proposed for the composition of CoFe 2– x Er x O 4 : [Co x 2+ Fe 1– x 3+ ] A [Co 1– x 2+ Fe 1+ x –δ 3+ Er δ 3+ ] B O 4 2– , where A- and B-sites represent the tetrahedral and octahedral position, respectively. In the present case, CoFe 2 O 4 is an inverse spinel structure in which half of the ferric ions preferentially occupy the tetrahedral (A-sites) and the other half occupy the octahedral sites (B-sites). , On the other hand, paramagnetic Er ions prefer to occupy the octahedral site for their larger ionic radius (0.89 Å) as compared to the ionic radius of Fe 3+ (0.66 Å). Thus, the values of r A and r B can be calculated from the cation distribution of the cubic spinel system by the following equations …”

Section: Resultsmentioning

confidence: 65%

“…In the present case, CoFe 2 O 4 is an inverse spinel structure in which half of the ferric ions preferentially occupy the tetrahedral (A-sites) and the other half occupy the octahedral sites (B-sites). 5 , 31 On the other hand, paramagnetic Er ions prefer to occupy the octahedral site for their larger ionic radius (0.89 Å) as compared to the ionic radius of Fe 3+ (0.66 Å). Thus, the values of r A and r B can be calculated from the cation distribution of the cubic spinel system by the following equations 32 …”

Section: Resultsmentioning

confidence: 99%

“…The magnetocrystalline anisotropy constant, K , largely depends on the saturation magnetization value. 5 Also, the anisotropy field H k for a cubic crystal along with the easy direction [1 0 0] can be obtained using the relation 39 , 40 …”

Section: Resultsmentioning

confidence: 99%

“…The replacement of trace amounts of rare earth ions on cobalt ferrites can alter their magnetic behaviors, which makes them suitable for hyperthermia applications. 5 The magnetic and dielectric properties of cobalt ferrite rely on the cation distribution, and the properties can be modified by wavering the location of cations in the interstitial sites. Among the rare earth ions, Er 3+ is chosen as the doping material as it has a relatively higher magnetic moment (7 μ B ) than Fe 3+ (5.92 μ B ).…”

Section: Introductionmentioning

confidence: 99%

“…The physical properties of CoFe 2 O 4 strongly depend on substituting materials, annealing temperature, grain size, and also on the synthesis method. The replacement of trace amounts of rare earth ions on cobalt ferrites can alter their magnetic behaviors, which makes them suitable for hyperthermia applications . The magnetic and dielectric properties of cobalt ferrite rely on the cation distribution, and the properties can be modified by wavering the location of cations in the interstitial sites.…”

Section: Introductionmentioning

confidence: 99%

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Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

et al. 2022

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This study reports the formation of Er-doped nanocrystalline cobalt ferrite with the formula CoFe 2– x Er x O 4 (0.0 ≤ x ≤ 0.10) from nontoxic metal precursors Co(NO 3 ) 2 ·6H 2 O, Fe(NO 3 ) 3 ·9H 2 O, and Er(NO 3 ) 3 ·5H 2 O through an easy and economical sol–gel route in which citric acid is served as the chelating agent. The as-prepared powder was annealed at 700 °C for 3 h in ambient air to get the required spinel structure. The annealed samples were subjected to structural and magnetic characterization. The X-ray diffraction (XRD) data of the samples confirmed the cubic spinel structure formation. The average crystallite size evaluated from XRD data increased from 21 to 34 nm with the substitution of Er due to the larger atomic size of Er 3+ than Fe 3+ . Moreover, the crystallite size obtained from XRD data are well matched with the particle size measured from transmission electron microscopy images. The lattice parameters obtained from XRD data agree well with the values estimated from theoretical cation distribution and Rietveld refinement calculation. The hysteresis curve exhibits the particles are soft ferromagnetic and the coercivity increased from 54.7 to 76.6 kA/m with maximum saturation magnetization, M s = 61 emug –1 for 0.10 Er content. The squareness ratios were found to be less than 0.5, which indicates the single-domain nature of our particles. The blocking temperature measured from field cooled-zero field cooled curves is T B > 350 K for all the samples, which is much higher than the room temperature (300 K). The enhancement of saturation magnetization and coercivity has been explained based on the crystallite size, anisotropy constant, and cation distribution. Thus, the structural and magnetic properties of CoFe 2 O 4 nanoparticles (NPs) can be tuned by Er incorporation and these NPs can be applied in different soft magnetic devices.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

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Mössbauer study of iron oxide nanoparticles

Karra,

Sarafidis

2024

Applied Research

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Magnetic nanoparticles have recently attracted attention for biochemical and medical applications like drug delivery and hyperthermia for a variety of reasons with most important being their stability, chemical compatibility, and suitable magnetic properties like moderate specific mass magnetization. Cobalt ferrites are a well‐studied family of materials and the partial substitution of Fe3+ cations by rare earth (RE) ones may be used to tune the magnetic properties. In the present work pure and substituted Co ferrite nanoparticles with nominal stoichiometry CoFe2‐xRxO4 (R = Yb, Gd; x = 0.05, 0.1, 0.3) synthesized by the co‐precipitation method are studied with 57Fe Mössbauer spectroscopy in order to determine the incorporation of RE ions in the spinel lattice. The fitting procedure was based on the standard spinel model using two sextets for the octahedral and the tetrahedral coordinated positions of Fe atoms. All isomer shift values were found within the typical range of high spin ferric ions while quadrupole splitting values strongly suggest that there is a substitution preference; RE ions replace iron ones in octahedral sites. The inversion parameter was found to decrease with RE content (lowest value about 0.534 for CoFe1.90Yb0.10O4) and thermal treatment always results in changing the material towards normal spinel, while pure CoFe2O4 was inverse. Thermal treatment of substituted materials in ambient air at temperature range 1500‐1700 K for 12 hours increase crystallite size and changes the degree of inversion.This article is protected by copyright. All rights reserved.

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Structural, morphological, and magnetic studies of spinel ferrites derived from layered double hydroxides

et al. 2022

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Effect of Er substitution on the magnetic, Mössbauer spectroscopy and dielectric properties of CoFe2−xErxO4 (x = 0.00, 0.01, 0.03, 0.05) nanoparticles

Cited by 17 publications

References 52 publications

Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

Mössbauer study of iron oxide nanoparticles

Structural, morphological, and magnetic studies of spinel ferrites derived from layered double hydroxides

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Effect of Er substitution on the magnetic, Mössbauer spectroscopy and dielectric properties of CoFe2−xErxO4 (x = 0.00, 0.01, 0.03, 0.05) nanoparticles

Cited by 17 publications

References 52 publications

Sol–Gel Route for the Synthesis of CoFe2–xErxO4 Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

Sol–Gel Route for the Synthesis of CoFe2–xErxO4 Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

Mössbauer study of iron oxide nanoparticles

Structural, morphological, and magnetic studies of spinel ferrites derived from layered double hydroxides

Contact Info

Product

Resources

About

Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications

Sol–Gel Route for the Synthesis of CoFe_2–xEr_xO₄ Nanocrystalline Ferrites and the Investigation of Structural and Magnetic Properties for Magnetic Device Applications