The effect of doping on global lattice properties of magnetite Fe3−xMexO4 (Me=Zn, Ti and Al)

Ka̧kol, Z.; Owoc, D.; Przewoźnik, J.; Sikora, Marcin; Kapusta, Cz.; Zając, D.; Kozłowski, A.; Sabol, J.; Honig, J.M.

doi:10.1016/j.jssc.2012.04.001

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…However, it might have effect on the properties of the glassy matrix which remained after magnetite crystallization. What is peculiar for Fe ions is their high tendency toward clustering and the formation of Fe-rich submicroscopic domains even in melts [33]. That makes the glass unstable relative to crystallization at high Fe content if submitted to thermal treatments [34].…”

Section: Methodsmentioning

confidence: 99%

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

et al. 2017

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Abstract:The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe 2 O 3 , in the presence of two types of nucleating agents, Cr 2 O 3 and P 2 O 5 , were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

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Section: Methodsmentioning

confidence: 99%

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

et al. 2017

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“…Magnetite has a small intrinsic range of nonstoichiometry due to iron-deficiency as Fe 3(1−δ) O 4 up to 3δ ≈ 0.035. Studies of nonstoichiometric and lightly cation-doped magnetites showed that T V is suppressed by doping, and a change from sharp first order to broad second order Verwey transitions was reported around hole doping of x = 3δ = 0.012 48 , 49 as shown in Figure 4 . The lattice distortion associated with formation of the low temperature Cc state is observed in both first and second order regimes, and no change in phonon spectra between the regimes was found in nuclear inelastic scattering experiments.…”

Section: Resultsmentioning

confidence: 99%

“… Variations of T V and the monoclinic angle of the low temperature Cc cell with doping parameters for nonstoichiometric and cation-doped magnetites in ref ( 49 ). The break between first and second order regimes of the Verwey transition is marked by the vertical line.…”

Section: Resultsmentioning

confidence: 99%

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Magnetism and the Trimeron Bond

Attfield

2022

Chem. Mater.

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A review of progress in understanding the Verwey transition in magnetite (Fe 3 O 4 ) over the past decade is presented. This electronic and structural transition at T V ≈ 125 K was reported in 1939 and has since been a contentious issue in magnetism. Long range Fe 2+ /Fe 3+ charge ordering has been confirmed below the transition from crystal structure refinement, and Fe 2+ orbital ordering and formation of trimerons through weak bonding of Fe 2+ states to two Fe neighbors has been discovered. This model has accounted for many spectroscopic observations such as the 57 Fe NMR frequencies. The trimeron lifetime has been measured, and trimeron soft modes have been observed. The origin of the first to second order crossover of Verwey transitions in doped magnetites has been revealed by a nanoparticle study. Electronic and structural fluctuations are found to persist to temperatures far above T V and local structural distortions track the bulk magnetization, disappearing at the 850 K Curie transition. New binary mixed-valent iron oxides discovered at high pressure are found to have electronic transitions and orbital molecule ground states similar to those of magnetite.

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“…Our samples #2 and #3, respectively, lie in the firstand second-order Verwey transition regimes. It was originally thought that second-order samples did not show a structural transition at T V , but a subsequent study reported that a distortion of the cubic cell is present in the second-order regime, modelled with a rhombohedral R 3m cell 18 . A recent Mössbauer and room temperature diffraction study suggested a change of lattice symmetry for Fe 3-z Zn z O 4 between firstand second-order regimes 19 Fig.…”

Section: Resultsmentioning

confidence: 99%

Site-selective doping of ordered charge states in magnetite

et al. 2020

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Charge ordering creates a spontaneous array of differently charged ions and is associated with electronic phenomena such as superconductivity, colossal magnetoresistances (CMR), and multiferroicity. Charge orders are usually suppressed by chemical doping and site selective doping of a charge ordered array has not previously been demonstrated. Here we show that selective oxidation of one out of eight distinct Fe 2+ sites occurs within the complex Fe 2+ /Fe 3+ ordered structure of 2%-doped magnetite (Fe 3 O 4), while the rest of the charge and orbitally ordered network remains intact. This 'charge order within a charge order' is attributed to the relative instability of the trimeron distortion surrounding the selected site. Our discovery suggests that similar complex charge ordered arrays could be used to provide surface sites for selective redox reactions, or for storing information by doping specific sites.

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The effect of doping on global lattice properties of magnetite Fe3−xMexO4 (Me=Zn, Ti and Al)

Cited by 11 publications

References 33 publications

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

Magnetism and the Trimeron Bond

Site-selective doping of ordered charge states in magnetite

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