57Fe Mössbauer study of CoCrxFe2-xO4 nano ferrite

Tiwari, Preeti; Verma, R.; Modak, S. S.; Reddy, V. Raghavendra; Mazaleyrat, F.; Kane, S. N.

doi:10.1007/s10751-021-01781-z

Cited by 6 publications

(15 citation statements)

References 29 publications

(86 reference statements)

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“…With increasing Zn-content, the B-site population of Fe 3+ , Zn 2+ ions increases, and that of Co 2+ ions decreases. Variation of cationic distribution leads to modification of inversion degree range between 0.67 -1.0, Oxygen parameter range between 0.3786 -0.3870 suggests the variation of disorder; and is consistent with earlier studies e. g. in - [6,9].…”

Section: Xrdsupporting

confidence: 92%

“…Perusal of fig. 3 shows that with increasing Zn-content, decrease of θ1, θ2, θ5 suggests weakening of A-O-B, A-O-A interaction through concurrent increase of θ3, θ4 suggests strengthening of BOB interaction, and would reveal changes in magnetic properties is consistent with earlier studies e. g. in - [6,9].…”

Section: Xrdsupporting

confidence: 88%

“…In the studied samples, u varies between 0.3788  0.3807, which is higher than its ideal value of 0.375 [9], reveal enhanced disorder with respect to ideal spinel structure, and thus would mirror in magnetic properties [9]. As is known that Co-ferrite shows inverse spinel structure, and Zn-ferrite has normal spinel structure, so Zn-addition in Co-ferrite would lead to changes in the inversion degree .…”

Section: Xrdmentioning

confidence: 88%

“…Bond angles are closely related to the strength of A-O-B, B-O-B and, A-O-A super-exchange interaction [1]. Bond angles θ1 , θ2 reveal information on A-O-B, θ3 , θ4 provide information on B-O-B and, θ5 gives information on A-O-A super-exchange interaction [9,32]. Perusal of fig.…”

Section: Xrdmentioning

confidence: 99%

“… in [3,9], described by experimental relation: Hc = 58.6 K1 -53.3. Variation of Hc with DW-H as shown in the inset of fig.…”

Section: Xrdmentioning

confidence: 99%

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Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Kane¹,

Verma²,

Modak

et al. 2022

Hyperfine Interact

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We report on the synthesis of spinel Co1-xZnxFe2O4 (x=0.00.56) ferrites by sol-gel auto-combustion method. Xray diffraction 'XRD', magnetic measurements were used to study compositionaldependence of structural, magnetic properties, connection among them. Mössbauer spectroscopy was used to identify non-magnetic-phase, its effect on magnetic properties. Single-phased nano spinel-ferrite formation is confirmed by XRD. Increasing Zn-content leads to structural modifications such as decrease of lattice parameter, grain diameter DW-H, alteration of inversion parameter, disorder, tensile-strain, dislocation density, variation of A-O-B, A-O-A, B-O-B superexchange-interaction and canting angles. Cationic distribution suggests that Fe 3+ , Co 2+ ions reside on both A, Bsites, and with increasing Zn-content, B-site population of Fe 3+ , Zn 2+ ions increases; while that of Co 2+ ions decreases. Saturation magnetization shows noticeable dependence on canting angle suggests that the magnetization in the studied samples is described by Yafet-Kittel three-sub-lattice model. Coercivity Hc values are consistent with anisotropy, and its dependence on DW-H suggests that the studied samples are in overlap-region between multiple-domains/single-domain. Reduced-remanence indicate the variation of inter-grain magnetostatic-interaction, isotropic-behavior of multi-domain particles. Observed broad peaks in magnetization derivative with field suggest large-number of dislocations, more-uniform particle-size. Switching-fielddistribution proposes potential application of the studied x=0.0 sample in high density recording, and sample with x=0.56 in targeted drug delivery. Mössbauer measurements confirm three-magnetic-components corresponding to A,B-sites, Fe3+ ions in grain boundaries/surface, Fe has 3+ oxidation state, and growing paramagneticdoublet, alone does not explain the trend of Ms, suggesting that it is a collective-effect of structural-modification, presence of paramagnetic-doublet.

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Section: Xrdsupporting

confidence: 92%

Section: Xrdsupporting

confidence: 88%

Section: Xrdmentioning

confidence: 88%

Section: Xrdmentioning

confidence: 99%

“… in [3,9], described by experimental relation: Hc = 58.6 K1 -53.3. Variation of Hc with DW-H as shown in the inset of fig.…”

Section: Xrdmentioning

confidence: 99%

See 3 more Smart Citations

Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Kane¹,

Verma²,

Modak

et al. 2022

Hyperfine Interact

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Effect of thermal treatment on structural, Mössbauer and magnetic properties of Zn-nanoferrite

Kane,

Verma,

Modak

et al. 2024

Interactions

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We report synthesis of spinel ZnFe2O4 ferrite by solution combustion method. Room temperature x-ray diffraction 'XRD'; magnetic; 57 Fe Mössbauer measurements were used to probe thermal treatment dependence of the structural, magnetic properties, and connection between them. Mössbauer spectroscopy was particularly used to identify the presence of magnetic/non−magnetic phases, their effect on magnetic properties. XRD confirms the formation of spinel phase, trace of α−Fe2O3 was also detected. Thermally treated samples show: i) substantial increase of grain diameter: 20.3 to 48.8 nm, presence of compressive−strain, ii) increase of inversion parameter: 0.20 to 0.65, iii) redistribution of Zn 2+ , Fe 3+ ions on A, B site, therefore increasing the disorder, iv) strengthening of A−O−B, A−O−A, with simultaneous weakening of B−O−B superexchange interaction, v) increase of magnetic−dead−layer thickness, thus affecting magnetic properties. Coercivity variation with grain diameter suggests that the studied samples lie in the overlap region between single/multiple−domains. Non−zero canting angle suggests the applicability of Yafet−Kittel three sub lattice model. Magnetization behaviour is explained using core (ordered−spin)−shell (spin−canting) model. Mössbauer results confirm: a) the 3+ state of Fe ions, b) the presence of α−Fe2O3 phase, and being antiferromagnetic reduces the saturation magnetization. Thermal treatment assisted modification of line widthrange between 0.42 to 0.72 mm/s, is attributable to surface strain/domain pinning. Mössbauer spectra confirm the presence of two superparamagnetic doublets that are explained by core (lower quadrupole splitting) − shell (higher quadrupole splitting) model. XRD, magnetic measurements combined with Mössbauer spectrosopy, provide improved understanding on the effect of thermal treatments on magnetic properties.

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Impact of shape and size of particles on the magnetic properties of chromium doped cobalt ferrite

Mohammadbagheri

Jaberolansar

Kameli

et al. 2023

Materials Chemistry and Physics

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57Fe Mössbauer study of CoCrxFe2-xO4 nano ferrite

Cited by 6 publications

References 29 publications

Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Structural, Mössbauer and magnetic study of Co1-xZnxFe2O4 (x = 0.0 − 0.56) nano ferrites

Effect of thermal treatment on structural, Mössbauer and magnetic properties of Zn-nanoferrite

Impact of shape and size of particles on the magnetic properties of chromium doped cobalt ferrite

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