Superparamagnetic ZnFe2O4 nanoparticles: The effect of Ca and Gd doping

Bini, Marcella; Tondo, Christian; Capsoni, Doretta; Mozzati, Maria Cristina; Albini, Benedetta; Galinetto, P.

doi:10.1016/j.matchemphys.2017.10.033

Cited by 71 publications

(24 citation statements)

References 42 publications

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“…[18] combined with D obtained from the results of XRD and TEM, the negligible coercivity (H c ) and remanent magnetism (M r ) together with unsaturated magnetization at relatively high magnetic field could help to confirm the superparamagnetism of our HZFO nanoparticles. However, the superparamagnetism of HZFO nanoparticles is not the emphasis in this study, and will be discussed in another report systematically.…”

mentioning

confidence: 66%

A Comparative Study of Spinel ZnFe2O4 Ferrites Obtained via a Hydrothermal and a Ceramic Route: Structural and Magnetic Properties

Zhu

Cao

et al. 2020

Preprint

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The spinel ZnFe2O4 specimens were obtained via a hydrothermal and a ceramic method, respectively, and their structural and magnetic properties were comparatively studied. It was found that all the specimens exhibited a single-phase and mixed spinel structure. The magnetism of specimens synthesized via the hydrothermal method is obviously greater than that of specimen prepared via the ceramic method. This can be ascribed to the occupancy of Fe ions resulted from the loss of Zn during the hydrothermal process.

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mentioning

confidence: 66%

A Comparative Study of Spinel ZnFe2O4 Ferrites Obtained via a Hydrothermal and a Ceramic Route: Structural and Magnetic Properties

Zhu

Cao

et al. 2020

Preprint

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“…i.e. the irreversible temperature (T irr ), and its distance from T B [32] . The work of Klemens Rumpf et al [61] has been very significant, showing that the decrease in the concentration of the particle solution results in a weakening of the magnetic coupling between the particles, which leads to a shift of the blocking temperature towards lower values, and that the decrease in particle size also leads to a decrease of the blocking temperature.…”

Section: Magnetic Analysismentioning

confidence: 99%

“…The most specific results in this work is the obtaining of Gd 3+ and Sm 3+ co-doped zinc nanoferrites, having a blocking temperature much higher than that of pure zinc ferrite, a result which is rarely obtained in other works. synthesized by microwave combustion method [32] who reported that T B = 32 K, . The improve in T B of the sample can be explained by the larger degree of cation inversion of the sample synthesized at lower temperatures, resulting by larger magnetic anisotropy [63].…”

Section: Magnetic Analysismentioning

confidence: 99%

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

Belaiche

Minaoui

Ouadou

et al. 2020

Preprint

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Highly crystalline ZnFe1.98Sm0.01Gd0.01O4 nanoferrites were prepared by co-precipitation method for the first time. The nanoparticles were characterized using thermogravimetric and differential scanning calorimetry analysis (TGA and DSC), which shows the thermal behavior of the reagents mixture. XRD analysis confirms the formation of nanocrystalline ferrite phase with Fd3m space group, and the particle size was observed to be 11 nm . The FTIR reveals two based bands of absorption characterize the formation of the spinel structure. An exhaustive study of the magnetic properties, morphology, crystallinity and effects of co-doping Gd3 + and Sm3 + was presented in detail. The average crystallites size was observed to decrease for Gd3+ and Sm3+ co-doping. Magnetic measurements reveal weak ferrimagnetic behavior at low temperature and superparamagnetic at high temperature with a blocking temperature at 55 K.

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“…Thus, it was observed that there was very little mercuric ion reduction (Fig 9), which may be linked to the bandgap of 1.94 eV -and can be attributed to the presence of ZnO 2 Fe 4 -providing a rapid recombination of the electron/hole pairs (e -/h + ) and reducing the quantum efficiency of the material. This problem can be solved by doping the zinc ferrite with Ag, as related in the literature (Harish et al, 2012), or with other materials such as Ca and Gd (Bini et al, 2018). The photocatalytic performance is significantly influenced by the reaction conditions, such as: incident light spectrum and intensity, reaction temperature, amount of catalyst, the addition of cocatalysts, the pH of the solution, reactor design and configuration, and so on.…”

Section: Amentioning

confidence: 99%

CHARACTERIZATION-PERFORMANCE OF ZnO AND ZnO/ZnFe2O4 CATALYST USING ARTIFICIAL AND SOLAR LIGHT FOR MERCURY (II) REDUCTION

Coelho

Neto

Ivashita

et al. 2019

Braz. J. Chem. Eng.

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This study describes the application of ZnO commercial oxide and ZnO/ZnFe 2 O 4 mixed oxides to reduce the mercury ion (Hg 2+) in the aqueous phase. The catalysts synthesized were characterized by thermogravimetric analysis, adsorption and desorption of N 2 , scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, photoacoustic spectroscopy and Mössbauer spectroscopy. The heterogeneous photocatalysis process was studied in synthetic effluent treatment containing mercury chloride (HgCl 2) in a batch and solar reactor. The results indicated that commercial ZnO catalyst totally reduced the Hg (II), in all conditions and reaction systems studied. On the other hand, for the mixed oxides (ZnO/ZnFe 2 O 4), there was a decrease in the reduction efficiency in the batch reactor, indicating no ability to reduce Hg(II) in the presence of sunlight.

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Superparamagnetic ZnFe2O4 nanoparticles: The effect of Ca and Gd doping

Cited by 71 publications

References 42 publications

A Comparative Study of Spinel ZnFe2O4 Ferrites Obtained via a Hydrothermal and a Ceramic Route: Structural and Magnetic Properties

A Comparative Study of Spinel ZnFe2O4 Ferrites Obtained via a Hydrothermal and a Ceramic Route: Structural and Magnetic Properties

New Nanosized (Gd3+, Sm3+) Co-doped Zinc Ferrite for Telecommunication Applications. Magnetic and Structural Properties.

CHARACTERIZATION-PERFORMANCE OF ZnO AND ZnO/ZnFe2O4 CATALYST USING ARTIFICIAL AND SOLAR LIGHT FOR MERCURY (II) REDUCTION

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