Mössbauer spectroscopy of NiFe2O4 nanoparticles: The effect of Ni2+ in the Fe3+ local microenvironment in both tetrahedral and octahedral sites

Ушаков, М. В.; Senthilkumar, Baskar; Selvan, R. Kalai; Felner, I.; Оштрах, М. И.

doi:10.1016/j.matchemphys.2017.09.011

Cited by 22 publications

(10 citation statements)

References 38 publications

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“…As shown in Figure S8, Supporting Information, the Mössbauer spectrum of the sample ir‐2e16 at low temperature exists a similar sextet signal compared to that of pure NiFe 2 O 4 , indicating the existence of NiFe 2 O 4 phase. [ 19 ] Therefore, according to the results of XRD, TEM, Raman, and Mössbauer measurements, we can definitely conclude that NiO/NiFe 2 O 4 heterostructure is formed when the irradiation fluence is higher than 1 × 10 16 ions cm −2 .…”

Section: Resultsmentioning

confidence: 76%

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting

Zhong

Gao

Wang

et al. 2021

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Oxygen evolution reaction (OER) is an obstacle to the electrocatalytic water splitting due to its unique four‐proton‐and‐electron‐transfer reaction process. Many methods, such as engineering heterostructure and introducing oxygen vacancy, have been used to improve the catalytic performance of electrocatalysts for OER. Herein, the above two kinds of regulation are simultaneously realized in a catalyst by using unique ion irradiation technology. A nanosheet structured NiO/NiFe2O4 heterostructure with rich oxygen vacancies converted from nickel–iron layered double hydroxides by Ar+ ions irradiation shows significant enhancement in both OER and hydrogen evolution reaction performance. Density functional theory (DFT) calculations reveal that the construction of NiO/NiFe2O4 can optimize the free energy of O* to OOH* process during OER reaction. The oxygen vacancy‐rich NiO/NiFe2O4 nanosheets have an overpotential of 279 mV at 10 mA cm−2 and a low Tafel slope of 42 mV dec−1. Moreover, this NiO/NiFe2O4 electrode shows an excellent long‐term stability at 100 mA cm−2 for 450 h. The synergetic effects between NiO and NiFe2O4 make NiO/NiFe2O4 heterostructure have high conductivity and fast charge transfer, abundant active sites, and high catalytic reactivity, contributing to its excellent performance.

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Section: Resultsmentioning

confidence: 76%

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting

Zhong

Gao

Wang

et al. 2021

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“…16,17 * Electronic address: sspsg2@iacs.res.in Plenty of works were performed on the doping effect of NFO, which significantly influenced the magnetic, electronic, and structural properties. 15,[18][19][20][21][22][23][24][25][26] Nanoscale properties of NFO have been investigated providing rich consequences in the magnetic and dielectric properties for the nanoparticles [27][28][29][30][31][32][33] and films. [34][35][36] The spin-filtering effect has been proposed using the first principles density functional theory for NFO, 37,38 which was corroborated for NFO ultrathin films.…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric order associated with ordered occupancy at the octahedral site of the inverse spinel structure of multiferroicNiFe2O4

et al. 2019

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We report a ferroelectric order at ∼ 98 K for NiFe2O4, which carries an inverse spinel structure with a centrosymmetric F d3m structure at room temperature. The value of spontaneous electric polarization is considerably high as ∼ 0.29 µC/cm 2 for 5 kV/cm poling field. The electric polarization decreases considerably (∼ 17 %) around liquid nitrogen temperature upon application of 50 kOe field, proposing a significant magnetoelectric coupling. The synchrotron diffraction studies confirm a structural transition at ∼ 98 K to a noncentrosymmetric structure of P 4122 space group. The occurrence of polar order is associated with an ordered occupancy of Ni and Fe atoms at the octahedral sites of the P 4122 structure, instead of random occupancies at the octahedral site of the inverse spinel structure. The results propose that NiFe2O4 is a new type-II multiferroic material.

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“…The Fe 3+ cations occupy both [B] and (A) sites while Ni 2+ cations occupy the [B] sites only. Firstly, two samples of nanosized NiFe 2 O 4 particles, which were synthesized by solution combustion method using two different fuels: EDTA (C 10 H 16 N 2 O 8 ) and urea (CH 4 N 2 O), and named NA and NB, respectively, were studied by Mössbauer spectroscopy with a high velocity resolution in [ 73 , 77 , 78 , 79 ]. Characterization of NA and NB samples by XRD showed the presence of the NiFe 2 O 4 spinel structure with the same lattice parameter a and different crystallite sizes calculated by the Scherrer equation: 26 nm for NA and 46 nm for NB.…”

Section: Nanosized Ferritesmentioning

confidence: 99%

“…These misfits indicate that the model of two magnetic sextets is not sufficient for the spectrum fit. Based on the above-mentioned study of NiFe 2 O 4 nanoparticles with average sizes of 25 and 35 nm using the calculation of different numbers of Ni 2+ cations in the 57 Fe local microenvironments in both (A) and [B] sites [ 79 ], the same model of a superposition of 10 magnetic sextets was applied to fit this Mössbauer spectrum. The result of this fit demonstrates significant improvement of the differential spectrum (see Figure 57 a).…”

Section: Nanosized Ferritesmentioning

confidence: 99%

Mössbauer Spectroscopy with a High Velocity Resolution in the Studies of Nanomaterials

et al. 2022

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The present review describes our long experience in the application of Mössbauer spectroscopy with a high velocity resolution (a high discretization of the velocity reference signal) in the studies of various nanosized and nanostructured iron-containing materials. The results reviewed discuss investigations of: (I) nanosized iron cores in: (i) extracted ferritin, (ii) ferritin in liver and spleen tissues in normal and pathological cases, (iii) ferritin in bacteria, (iv) pharmaceutical ferritin analogues; (II) nanoparticles developed for magnetic fluids for medical purposes; (III) nanoparticles and nanostructured FINEMET alloys developed for technical purposes. The results obtained demonstrate that the high velocity resolution Mössbauer spectroscopy permits to excavate more information and to extract more spectral components in the complex Mössbauer spectra with overlapped components, in comparison with those obtained by using conventional Mössbauer spectroscopy. This review also shows the advances of Mössbauer spectroscopy with a high velocity resolution in the study of various iron-based nanosized and nanostructured materials since 2005.

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Mössbauer spectroscopy of NiFe2O4 nanoparticles: The effect of Ni2+ in the Fe3+ local microenvironment in both tetrahedral and octahedral sites

Cited by 22 publications

References 38 publications

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting

Ferroelectric order associated with ordered occupancy at the octahedral site of the inverse spinel structure of multiferroicNiFe2O4

Mössbauer Spectroscopy with a High Velocity Resolution in the Studies of Nanomaterials

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Mössbauer spectroscopy of NiFe2O4 nanoparticles: The effect of Ni2+ in the Fe3+ local microenvironment in both tetrahedral and octahedral sites

Cited by 22 publications

References 38 publications

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe2O4 Heterostructure for Enhanced Electrocatalytic Water Splitting

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe2O4 Heterostructure for Enhanced Electrocatalytic Water Splitting

Ferroelectric order associated with ordered occupancy at the octahedral site of the inverse spinel structure of multiferroicNiFe2O4

Mössbauer Spectroscopy with a High Velocity Resolution in the Studies of Nanomaterials

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Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting

Ion Irradiation Inducing Oxygen Vacancy‐Rich NiO/NiFe₂O₄ Heterostructure for Enhanced Electrocatalytic Water Splitting