Tuning the superparamagnetic effect in ZnFe2O4 nanoparticles with Mg, Ga doping

Gazzola, Gianluca; Ambrosetti, Marco; Mozzati, Maria Cristina; Albini, Benedetta; Galinetto, P.; Bini, Marcella

doi:10.1016/j.matchemphys.2021.125069

Cited by 11 publications

(7 citation statements)

References 40 publications

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“…In this case, we reasonably excluded the first hypothesis in favour of the second one, since by increasing the measuring temperature the EPR signals of all the investigated samples are characterized by the same single broadened signal, observed at room temperature, without appreciable changing in the shape. Moreover, the trend of all the characteristic EPR parameters (g-factor, peak to peak linewidth, signal symmetry) is consistent with a ferrite system involved in a transition between SPM and PM states, as already shown for analogous samples in our previous contribution [16]. However, as an explanatory case, Fig.…”

Section: Resultssupporting

confidence: 90%

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

Albini

Restelli

Ambrosetti

et al. 2023

J Mater Sci: Mater Electron

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Raman spectroscopy was applied on nanostructured ZnFe2O4 system in order to correlate its structural, chemical, and vibrational properties to the functional behaviour, in view of the high sensitivity of the Raman probe to the cationic order in iron oxides. In particular we investigated pure and Ga/Mg doped zinc ferrite nanoparticles synthesised by co-precipitation route by means of Raman spectroscopy with a particular focus on the correlation between their structural and magnetic properties. We firstly studied the homogeneity of the samples at the micrometer scale and their stability under laser irradiation disregarding the presence of spurious iron oxides in favour of a highly defective external shell of the nanoparticles. This hypothesis was corroborated by varying the incident laser wavelength therefore changing the investigated volume. Furthermore, we estimated the inversion degree of the spinel structure finding good agreements with the trend of the magnetic features. All the evidence found through Raman spectroscopy are supported by the results obtained with X-Ray Powder Diffraction, Electron Paramagnetic Resonance and SQUID magnetometry.

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Section: Resultssupporting

confidence: 90%

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

Albini

Restelli

Ambrosetti

et al. 2023

J Mater Sci: Mater Electron

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“…Substitution of Zn 2+ with Ca 2+ in CaxZn1-xFe2O4 (x = 0.1, 0.3 and 0.5) increased the saturation magnetization at 15 K and enhanced the heating efficiency needed for application in magnetic hyperthermia [32]. Superparamagnetic behavior was noted in pure ZnFe2O4 and Mg doped ZnFe2O4 (Mg substitutes Zn), while Ga doping (Ga substitutes Fe) resulted in a paramagnetic state [33]. Co-doping with both dopants resulted in intermediate behavior.…”

Section: Doping and Substitution With Metal Ionsmentioning

confidence: 99%

Magnetic Spinel Ferrite Nanoparticles: From Synthesis to Biomedical Applications

Nikolic¹

2023

Magnetic Nanoparticles for Biomedical Applications

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Spinel ferrites are a widely investigated and applied class of materials with a cubic spinel lattice structure. Their unique multifunctional properties (magnetic characteristics, tunable shape/size, large number of active surface sites, high values of specific surface area, good chemical stability, and possibilities for enhancing properties through surface modification) influenced by the synthesis procedure make them attractive for biomedical applications as magnetic nanoparticles in drug delivery to a set target, magnetic hyperthermia, tissue engineering, magnetic extraction of biological components and magnetic diagnostics. In this review, we give an overview of up-to-date synthesis procedures for obtaining magnetic spinel nanoparticles and nanocomposites with optimal properties for biomedical applications.

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“…Evenly fundamental is the determination of lattice parameters as well as crystallite sizes: the Rietveld structural refinement on powder diffraction patterns can easily provide this information as well as the weight percentages of the phases and the occupancies of cationic sites, allowing us to determine the possible inversion of the spinel [40,48,49]. For example, the inversion in the ZFO spinel was found in the cases of Ca, Al, Mg, and Ga doping [44,50].…”

Section: Application Fields Of Ferritementioning

confidence: 99%

“…However, ferrites can be produced at low temperature (under 500 • C) in nanometric sizes [67]. Pure samples can be stabilized with a thermal treatment at 300 • C for a few hours, offering the advantage of lowering the costs of the entire process [50]. By increasing the temperature up to about 1400 • C, the sinterization level increases and pure samples with large particles can be obtained [65].…”

Section: Solid-state Synthesesmentioning

confidence: 99%

ZnFe2O4, a Green and High-Capacity Anode Material for Lithium-Ion Batteries: A Review

2021

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Ferrites, a broad class of ceramic oxides, possess intriguing physico-chemical properties, mainly due to their unique structural features, that, during these last 50–60 years, made them the materials of choice for many different applications. They are, indeed, applied as inductors, high-frequency materials, for electric field suppression, as catalysts and sensors, in nanomedicine for magneto-fluid hyperthermia and magnetic resonance imaging, and, more recently, in electrochemistry. In particular, ZnFe2O4 and its solid solutions are drawing scientists’ attention for the application as anode materials for lithium-ion batteries (LIBs). The main reasons are found in the low cost, abundance, and environmental friendliness of both Zn and Fe precursors, high surface-to-volume ratio, relatively short path for Li-ion diffusion, low working voltage of about 1.5 V for lithium extraction, and the high theoretical specific capacity (1072 mA h g−1). However, some drawbacks are represented by fast capacity fading and poor rate capability, resulting from a low electronic conductivity, severe agglomeration, and large volume change during lithiation/delithiation processes. In this review, the main synthesis methods of spinels will be briefly discussed before presenting the most recent and promising electrochemical results on ZnFe2O4 obtained with peculiar morphologies/architectures or as composites, which represent the focus of this review.

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Tuning the superparamagnetic effect in ZnFe2O4 nanoparticles with Mg, Ga doping

Cited by 11 publications

References 40 publications

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

Raman spectroscopy in pure and doped zinc ferrites nanoparticles

Magnetic Spinel Ferrite Nanoparticles: From Synthesis to Biomedical Applications

ZnFe2O4, a Green and High-Capacity Anode Material for Lithium-Ion Batteries: A Review

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