Structure and magnetic properties of Zn1−In Fe2O4 and ZnY Fe2−O4 nanoparticles prepared by coprecipitation

Milanović, Marija; Moshopoulou, E.; Σταμόπουλος, Δ.; Devlin, E.; Giannakopoulos, K.; Kontos, Athanassios G.; Eleftheriadis, Konstantinos; Gini, Maria I.; Nikolić, Ljubiša

doi:10.1016/j.ceramint.2012.10.011

Cited by 25 publications

(13 citation statements)

References 33 publications

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“…We found, for all the MW samples, a superparamagnetic behavior with saturation magnetization at RT between 6 and 10 emu/g at the maximum applied magnetic field of 3 T, with a more effective role played by Ca ions with respect to Gd ions substitution. A fair agreement is found with the M S values reported in the literature for pure and doped zinc ferrite spinels having comparable grain size and prepared by means of combustion synthesis or other methods [10,60,[62][63][64]. In ZnFe 2 O 4 , the inversion promotes super exchange interactions, in turn responsible of higher M S values with respect to the regular spinel.…”

Section: Magnetic Resultssupporting

confidence: 86%

Raman spectroscopy in Zinc Ferrites Nanoparticles

Galinetto¹,

Albini²,

Bini³

et al. 2018

Raman Spectroscopy

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ZnFe 2 O 4 ferrite nanoparticles are arousing a great interest in the biomedical field, thanks to their superparamagnetic behavior at room temperature. Functional properties depend on composition, size, nanoparticle architecture and, in turn, on the synthesis methods. Bulk ZnFe 2 O 4 has the normal spinel structure (all Zn 2+ ions in tetrahedral and all Fe 3+ ions in octahedral positions), but at the nanometric size inversion takes place with a cationic mixing on divalent and trivalent sites. The sensitivity of the Raman probe to cation disorder favored the appearance of several works on a rich variety of nanosized zinc ferrites. An overview on these results is reported and discussed at variance with synthesis methods, grain dimensions, and dopants. We add to this landscape our results from new nanosized powder samples made by microwave-assisted combustion, with different dopants (Ca, Sr on Zn site and Al, Gd on Fe site). A detailed analysis of A 1g , E g , 3F 2g Raman modes has been performed and Raman band parameters have been derived from bestfitting procedures and carefully compared to literature data. The vibrational results are discussed taking into account the characterization from X-ray powder diffraction raction, SEM-EDS probe, EPR spectroscopy and, of course, the magnetic responses.

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Section: Magnetic Resultssupporting

confidence: 86%

Raman spectroscopy in Zinc Ferrites Nanoparticles

Galinetto¹,

Albini²,

Bini³

et al. 2018

Raman Spectroscopy

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“…For the Co_0 and Co_1 samples, the magnetization curves have a semi-linear representation which indicates a paramagnetic state. For Co_2 and Co_3, the samples have a sigmoidal response but show no hysteresis, which suggests the presence of a saturated superparamagnetic component [40,41,42,43]. Sample Co_4 displayed a weak ferromagnetic behavior, as shown in Figure 6b with a small remanence (1.46 emu/g) and coercive fields (27 Oe).…”

Section: Resultsmentioning

confidence: 97%

Impact of Co2+ Substitution on Microstructure and Magnetic Properties of CoxZn1-xFe2O4 Nanoparticles

et al. 2019

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In the present work, we synthesized CoxZn1-xFe2O4 spinel ferrite nanoparticles (x= 0, 0.1, 0.2, 0.3 and 0.4) via the precipitation and hydrothermal-joint method. Structural parameters were cross-verified using X-ray powder diffraction (XRPD) and electron microscopy-based techniques. The magnetic parameters were determined by means of vibrating sample magnetometry. The as-synthesized CoxZn1-xFe2O4 nanoparticles exhibit high phase purity with a single-phase cubic spinel-type structure of Zn-ferrite. The microstructural parameters of the samples were estimated by XRD line profile analysis using the Williamson–Hall approach. The calculated grain sizes from XRPD analysis for the synthesized samples ranged from 8.3 to 11.4 nm. The electron microscopy analysis revealed that the constituents of all powder samples are spherical nanoparticles with proportions highly dependent on the Co doping ratio. The CoxZn1-xFe2O4 spinel ferrite system exhibits paramagnetic, superparamagnetic and weak ferromagnetic behavior at room temperature depending on the Co2+ doping ratio, while ferromagnetic ordering with a clear hysteresis loop is observed at low temperatures (5K). We concluded that replacing Zn2+ ions with Co2+ ions changes both the structural and magnetic properties of ZnFe2O4 nanoparticles.

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“…ZnFe 2 O 4 adopts the cubic spinel structure. Cations occupy one-eighth of the interstitial tetrahedral (A) and one-half of the octahedral (B) sites 3 .…”

Section: Introductionmentioning

confidence: 99%

“…Among numerous spinel ferrites, ZnFe 2 O 4 nanoparticles have attracted particular attention because of their unique chemical properties and thermal stability, as well as their particle-size-dependent magnetic properties 4 The coprecipitation technique is the most appropriate approach for synthesizing ZnFe 2 O 4 because it results in small crystals with a uniform distribution, is simple, and does not require a calcination step. On the basis of the theory underlying coprecipitation, several parameters (e.g., the counterions, ionic strength, pH, and precipitation temperature) can influence the structure and magnetic properties of the resultant ferrite 3 . A previous investigation found that the chemical composition of ZnFe 2 O 4 is influenced by the Zn/ Fe molar ratio, pH, sintering temperature, and sintering duration 6 .…”

Section: Introductionmentioning

confidence: 99%