Mechanochemical Synthesis of Wüstite, Fe<sub>1 – x</sub>O, in High-Energy Apparatuses

Emelyanov, D. A.; Korolev, K. G.; Михайленко, М. А.; Knotko, A.V.; Oleinikov, N. N.; Tret’yakov, Yu. D.; Болдырев, В. В.

doi:10.1023/b:inma.0000031998.30974.32

Cited by 11 publications

(9 citation statements)

References 6 publications

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“…Depending on the conditions of its formation and specially the conditions of its decomposition wüstite can produce highly dispersed nanoparticles of Fe 0 and Fe 3 O 4 [53]. Emel'yanove and co-workers showed that wüstite formed by high energy milling of Fe 0 and Fe 2 O 3 (hematite) when heated at 200 8C in vacuum produces a nanocomposite of Fe 0 /Fe 3 O 4 [53].…”

Section: Mechanistic Considerations: Formation Of Reactive Species Anmentioning

confidence: 99%

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Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Moura

Oliveira

Araújo

et al. 2006

Applied Catalysis A: General

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Section: Mechanistic Considerations: Formation Of Reactive Species Anmentioning

confidence: 99%

“…Emel'yanove and co-workers showed that wüstite formed by high energy milling of Fe 0 and Fe 2 O 3 (hematite) when heated at 200 8C in vacuum produces a nanocomposite of Fe 0 /Fe 3 O 4 [53].…”

Section: Mechanistic Considerations: Formation Of Reactive Species Anmentioning

confidence: 99%

Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Moura

Oliveira

Araújo

et al. 2006

Applied Catalysis A: General

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“…This is one of the few examples of wü stite NPs. [23,25,[28][29][30] In fact, wü stite is a metastable phase only obtained above 567 8C using solid state methods. [1] In order to obtain wü stite below 567 8C the process must be a kinetic one.…”

Section: Oxide Phase Identificationmentioning

confidence: 99%

Shape control of new Fe_xO–Fe₃O₄and Fe_1–yMn_yO–Fe_3–zMn_zO₄ nanostructures

Hofmann

Rusakova²,

Ould‐Ely

et al. 2008

Adv Funct Materials

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New nanoparticle shapes of iron oxide (FexOFe3O4, where 0.8 < x < 1) and iron‐manganese oxide (Fe1–yMnyOFe3–zMnzO4, where 0 < y < 1, and 0 < z < 3) were synthesized by decomposition of the corresponding metal formates in tri‐n‐octylamine/oleic acid mixtures at elevated temperatures (ca. 370 °C), under an inert atmosphere. Details of the syntheses leading to the various shapes of nanoparticles are provided as a function of the reactions parameters, that is, precursor type and concentration, surfactant concentration, water concentration, reaction time, and temperature. Different electron microscopy techniques were used to characterize the crystal phases and the novel shapes of these nanostructures. Nanoparticles of FexOFe3O4 were produced with different shapes, that is spheres, hexagons, and cubes, depending on the reaction conditions. By tuning the conditions, iron oxide nanocubes with concave faces were produced exclusively. Electron and X‐ray diffraction data reveal these nanocubes to be single‐crystal FexO (wüstite) with small amounts of Fe3O4 (magnetite). For the mixed metal system, solid solutions of Fe1–yMnyO with very small amounts of Fe3–zMnzO4 were observed, in which the produced oxide had a larger Fe:Mn ratio than present in the starting reagents. Adjusting the iron to manganese ratio in the mixed‐metal nanoparticles resulted in different shapes. Nanoparticles with ca. 1:1 (Fe:Mn) ratios displayed a ‘dog‐bone‐like’ morphology, which can be considered a shape in between a pure FexOFe3O4 nanocube and the rod‐like nanostructures previously reported for the manganese oxide system. In general, higher Fe:Mn ratios (e.g., 9:1) in the product resulted in nanostructures with cubic shapes, while lower Fe:Mn values (e.g., 2:8) resulted in long (ca. 200 nm) rod‐like nanostructures with flared ends. All of the nanostructures reported here exhibit internal structures that suggest a growth mechanism with etching on negatively curved rough crystal faces. Oxidation of the nanoparticles occurred with retention of their original shape.

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“…The studies of mechanical alloying used pure ferritic oxides as principal raw materials. Wüstite could be formed in the mechanical alloying processes of iron oxides/iron or hematite/carbon mixtures at low temperatures [9][10][11][12][13] , as well as in the milling of Ni/Fe 2 O 3 mixture 14) . In such investigations, wüstite was proposed to be the product of the reaction in a non-equilibrium state, promoted by the energy storing in the form of structural disorder and grain boundary 10) .…”

Section: Introductionmentioning

confidence: 99%

“…In such investigations, wüstite was proposed to be the product of the reaction in a non-equilibrium state, promoted by the energy storing in the form of structural disorder and grain boundary 10) . This energy could also affect the defect structure of wüstite product 13) . Whilst no models were proposed by these studies regarding the effect of energy on phase transformation, they did, however, suggest a line of enquiry for the formation of metastable wüstite in terms of energy.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Metastable Wüstite Formation in the Reduction Process of Iron Oxide below 570℃

2016

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The possibility of metastable wüstite below 570 C during the reduction of iron oxides was discussed. There was uncertainty regarding the formation of metastable wüstite in the reduction of hematite below 570 C. Planar disregistry (1/δ) was employed to predict the probability of metastable wüstite formation during the reduction process. The calculated results showed that the δ of wüstite/magnetite is similar to that of iron/magnetite with plain and normal structures, but less than ake and nger structures. The difference in disregistry of different geometries of interfaces was suggested to be the principal driving force for the formation of metastable wüstite. This implies that the formation of metastable wüstite always accompanies the nucleation of iron structures with high δ relative to magnetite. The latter structures form easily in supported iron, leading to the relatively common observation of metastable wüstite in an iron catalyst. The analysis showed that the temperature range for metastable wüstite formation, 400 C 500 C, was most likely to occur where it created a predominance of ake and nger structures.

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Mechanochemical Synthesis of Wüstite, Fe_{1 – x}O, in High-Energy Apparatuses

Cited by 11 publications

References 6 publications

Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Shape control of new Fe_xO–Fe₃O₄and Fe_1–yMn_yO–Fe_3–zMn_zO₄ nanostructures

Mechanism of Metastable Wüstite Formation in the Reduction Process of Iron Oxide below 570℃

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Mechanochemical Synthesis of Wüstite, Fe1 – xO, in High-Energy Apparatuses

Cited by 11 publications

References 6 publications

Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Highly reactive species formed by interface reaction between Fe0–iron oxides particles: An efficient electron transfer system for environmental applications

Shape control of new FexO–Fe3O4and Fe1–yMnyO–Fe3–zMnzO4 nanostructures

Mechanism of Metastable Wüstite Formation in the Reduction Process of Iron Oxide below 570℃

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About

Mechanochemical Synthesis of Wüstite, Fe_{1 – x}O, in High-Energy Apparatuses

Shape control of new Fe_xO–Fe₃O₄and Fe_1–yMn_yO–Fe_3–zMn_zO₄ nanostructures