Characterization of partially inverse spinel ZnFe2O4 with high saturation magnetization synthesized via soft mechanochemically assisted route

Lazarević, Zorica Ž.; Jovalekić, Čedomir; Ivanovski, Valentin N.; Rečnik, Aleksander; Milutinović, A.; Cekić, B.; Romčević, N.

doi:10.1016/j.jpcs.2014.03.004

Cited by 51 publications

(16 citation statements)

References 42 publications

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“…Its structure corresponds to normal spinel, where Zn +2 occupies the tetrahedral site and Fe +3 occupies the octahedral site, normally. Bulk ZnFe 2 O 4 has a normal spinel structure with nonmagnetic Zn 2+ ions in the A-site and magnetic Fe 3+ ions in the B-sites (in two antiparallel sublattices) and can be described by the formula (Zn 2+ )[Fe 3+ ↑Fe 3+ ↓]O 4 [14]. When the interactions between the sites decrease in bulk and room temperature magnetization is of the paramagnetic type.…”

Section: Introductionmentioning

confidence: 99%

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Hangai

Borsari

Aguiar

et al. 2017

J Mater Sci: Mater Electron

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Section: Introductionmentioning

confidence: 99%

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Hangai

Borsari

Aguiar

et al. 2017

J Mater Sci: Mater Electron

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“…The wide peak at 1290‐1300/cm can partly originate from remaining hematite, but also from multiphonon processes relating to zinc‐ferrite (2A 1g mode). The peak at 1050‐1060/cm corresponding to the 2F 2g (3) mode can also be attributed to multiphonon processes in zinc‐ferrite . The wide peak in the 1100‐1130/cm region increases with increase in laser strength.…”

Section: Resultsmentioning

confidence: 99%

Investigation of ZnFe₂O₄ spinel ferrite nanocrystalline screen‐printed thick films for application in humidity sensing

Nikolić

Vasiljević

Luković

et al. 2019

Int J Applied Ceramic Tech

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Zinc ferrite nanocrystalline powder was obtained by solid state synthesis of starting zinc oxide and hematite nanopowders. Field emission scanning electron microscopy and transmission electron microscopy, X‐ray diffraction, X‐ray photoelectron spectroscopy and Raman spectroscopy confirmed the formation of nanocrystalline zinc‐ferrite powder with a mixed spinel structure with small amounts of remaining zinc oxide and hematite as impurities. Thick film paste was formed and screen printed on test interdigitated PdAg electrodes on alumina substrate. Formation of a porous nanocrystalline structure was confirmed by scanning electron microscopy and Hg porosimetry. Humidity sensing properties of zinc ferrite thick films were investigated by monitoring the change in impedance in the relative humidity interval 30%‐90% in the frequency range 42 Hz‐1 MHz at room temperature (25°C) and 50°C. At 42 Hz at both analyzed temperatures the impedance reduced ~46 times in the humidity range 30%‐90%. The dominant influence of grain boundaries was confirmed by analysis of complex impedance with an equivalent circuit.

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“…The oxygen stretch from the heavier ZnO 4 appears at~648 cm À 1 while that of FeO 4 is at~715 cm À 1 . [24,25] Additionally, F2g (2) and F2g (3) modes corresponding to vibrations of octahedral groups can also be seen. The Eg pair is due to symmetric bending of oxygen with respect to cations in the tetrahedral sites.…”

Section: Synthesis and Characterization Of Znfe 2 O 4 -Nfmentioning

confidence: 94%

“…The high frequency first order mode A1g, above 600 cm À 1 ( Figure S1B, supporting information), is attributed to symmetric stretching of oxygen atoms along the cationoxygen bonds in the tetrahedral co-ordination. [24,25] The presence of a doublet mode suggests that ordered sub-lattices of both ZnO 4 and FeO 4 co-exist in the tetrahedral site of ZnFe 2 O 4 which implies some form of phase inversion. The oxygen stretch from the heavier ZnO 4 appears at~648 cm À 1 while that of FeO 4 is at~715 cm À 1 .…”

Section: Synthesis and Characterization Of Znfe 2 O 4 -Nfmentioning

confidence: 99%

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

2020

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Low‐cost, stable and highly active electrocatalysts for the oxygen evolution reaction (OER) are needed to improve the efficiency of hydrogen production via water splitting. However, developing such a catalyst is still a challenge. Zinc ferrite (ZnFe2O4) is non‐toxic and made from cheap and earth‐abundant materials making it a potential raw material for synthesizing “green” low‐cost catalysts for the OER. However, it has largely been ignored due to its low stability, conductivity and OER‐inactive Zn2+. Herein, ZnFe2O4 is used effectively as a pre‐catalyst to synthesize core‐shell ZnFe2O4@Zn(Fe)OOH polycrystalline heterostructures in situ via cyclic voltammetry. The ZnFe2O4@Zn(Fe)OOH heterostructures display much higher OER catalytic activity and stability than the benchmark RuO2 catalyst in alkaline medium, owing to its high conductivity, stability and electrochemically active surface area (ECSA). Our findings thus reveal a new and effective way by which ZnFe2O4 can be applied in water electrolysis.

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Characterization of partially inverse spinel ZnFe2O4 with high saturation magnetization synthesized via soft mechanochemically assisted route

Cited by 51 publications

References 42 publications

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Investigation of ZnFe₂O₄ spinel ferrite nanocrystalline screen‐printed thick films for application in humidity sensing

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

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Characterization of partially inverse spinel ZnFe2O4 with high saturation magnetization synthesized via soft mechanochemically assisted route

Cited by 51 publications

References 42 publications

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Superparamagnetic behaviour of zinc ferrite obtained by the microwave assisted method

Investigation of ZnFe2O4 spinel ferrite nanocrystalline screen‐printed thick films for application in humidity sensing

In Situ Electrochemical Formation of a Core‐Shell ZnFe2O4@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium

Contact Info

Product

Resources

About

Investigation of ZnFe₂O₄ spinel ferrite nanocrystalline screen‐printed thick films for application in humidity sensing

In Situ Electrochemical Formation of a Core‐Shell ZnFe₂O₄@Zn(Fe)OOH Heterostructural Catalyst for Efficient Water Oxidation in Alkaline Medium