Crystallographic and low frequency conductivity studies of the spinel systems CuFe2O4 and Cu1−x Zn x Ga0.1Fe1.9O4; (0.0 ≤ x ≤ 0.5)

Ata‐Allah, S.S.; Sayedahmed, F.M.; Kaiser, M. E.; Hashhash, A.

doi:10.1007/s10853-005-2427-4

Cited by 29 publications

(7 citation statements)

References 21 publications

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“…Results show that the conductivity increases when Fe is substituted with Mn. The conductivity is mainly caused by exchange interaction between B sites (B-O 2--B) with hopping of localized d-electrons between cations [40,41]. Substituting Mn into the structure will increase the conductivity as Mn can exist in more than one valence state (2?, 3?, and 4?)…”

Section: Dilatometry and Resistivity Measurementsmentioning

confidence: 99%

Characterization of MgMn x Fe2−x O4 as a possible cathode material for electrochemical reduction of NO x

Bræstrup

2009

J Appl Electrochem

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Spinel-type oxides of MgMn x Fe 2-x O 4 , x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, were synthesized as a solid state reaction and characterized with dilatometry and resistivity measurements up to 1000°C. Results showed a general decrease of the linear expansion and an increase in conductivity as a function of the Mn content. Point electrodes were analyzed from 300 to 600°C in a pseudo-threeelectrode setup in 1% NO, 1% NO 2 , and 10% O 2 using cyclic voltammetry. The activities in O 2 were in general very low whereas the activities in NO were slightly higher. The activities in NO 2 were for all materials much higher than the activities in O 2 . Even though Mn tends to decrease the activity of the materials, current ratios of I NO x =I O 2 have relatively high values in both NO and NO 2 .

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Section: Dilatometry and Resistivity Measurementsmentioning

confidence: 99%

Characterization of MgMn x Fe2−x O4 as a possible cathode material for electrochemical reduction of NO x

Bræstrup

2009

J Appl Electrochem

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“…2(a). In the present work and as in measuring the dielectric parameters at this very low frequency, the present measurements covers the range (≤100 Hz) which is not achieved for similar measurements [16,17]. In this range, Fig.…”

Section: Resultsmentioning

confidence: 66%

Effect of Zn substitution on relaxation characteristics and dielectric properties of Cu1−xZnxGa0.5Fe1.5O4 spinel

Fayek

Ata‐Allah

Zayed

et al. 2009

Journal of Alloys and Compounds

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“…Since a small amount of dopant ions can change structural properties of ferrites, 40 and the site preference of dopant ions might lead to transfer Fe 3+ from A-sites to B-sites and cause a crystallographic transformation from tetragonal to cubic structure. 41 Therefore, the structure of the as formed CuFe 2 O 4 in sewage sludge system will predominantly crystallize as cubic structure due to the existence and inuence of Al, 42 Si, 43 or other minor compositions.…”

Section: Potential Of Reusing Municipal Wastewater Sludge Ash For Cop...mentioning

confidence: 99%

Cubic and tetragonal ferrite crystal structures for copper ion immobilization in an iron-rich ceramic matrix

et al. 2016

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Crystallographic and low frequency conductivity studies of the spinel systems CuFe2O4 and Cu1−x Zn x Ga0.1Fe1.9O4; (0.0 ≤ x ≤ 0.5)

Cited by 29 publications

References 21 publications

Characterization of MgMn x Fe2−x O4 as a possible cathode material for electrochemical reduction of NO x

Characterization of MgMn x Fe2−x O4 as a possible cathode material for electrochemical reduction of NO x

Effect of Zn substitution on relaxation characteristics and dielectric properties of Cu1−xZnxGa0.5Fe1.5O4 spinel

Cubic and tetragonal ferrite crystal structures for copper ion immobilization in an iron-rich ceramic matrix

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