An X-Ray Study of the Wüstite (FeO) Solid Solutions

Jette, Eric R.; Foote, F.

doi:10.1063/1.1749215

Cited by 181 publications

(51 citation statements)

References 4 publications

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“…2b). Moreover, simulation of the extended X-ray absorption fine structure (EXAFS) results in Fe-O distances close to the ones found in Wüstite (Table 3) 27 . In addition, new scatterers emerge (Table 2 and Supplementary Fig.…”

Section: Synthesis and Characterizationmentioning

confidence: 90%

Metal organic framework-mediated synthesis of highly active and stable Fischer-Tropsch catalysts

et al. 2015

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Depletion of crude oil resources and environmental concerns have driven a worldwide research on alternative processes for the production of commodity chemicals. Fischer-Tropsch synthesis is a process for flexible production of key chemicals from synthesis gas originating from non-petroleum-based sources. Although the use of iron-based catalysts would be preferred over the widely used cobalt, manufacturing methods that prevent their fast deactivation because of sintering, carbon deposition and phase changes have proven challenging. Here we present a strategy to produce highly dispersed iron carbides embedded in a matrix of porous carbon. Very high iron loadings (440 wt %) are achieved while maintaining an optimal dispersion of the active iron carbide phase when a metal organic framework is used as catalyst precursor. The unique iron spatial confinement and the absence of large iron particles in the obtained solids minimize catalyst deactivation, resulting in high active and stable operation.

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Section: Synthesis and Characterizationmentioning

confidence: 90%

Metal organic framework-mediated synthesis of highly active and stable Fischer-Tropsch catalysts

et al. 2015

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“…According to the Fe-O phase diagram [41], the Fe:O ratio of wüstite intrinsically decreases towards its outer interface with magnetite [41,54] causing a gradient of defect concentration, which is fixed by the equilibrium oxygen activities at the interfaces with iron and with magnetite for any given temperature. This intrinsic gradient of stoichiometry can also reduce the volume of wüstite [55][56][57][58][59] with increasing distance to the iron substrate. Another factor affecting the internal stress situation in wüstite is dislocation creep at 650°C [1,60].…”

Section: Wu¨stitementioning

confidence: 99%

Evolution of Microstructure and Internal Stresses in Multi-Phase Oxide Scales Grown on (110) Surfaces of Iron Single Crystals at 650 °C

et al. 2009

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The evolution of microstructure and growth stresses in oxide scales grown on a (110) iron single crystal surface at 650°C was studied by electron backscatter diffraction and in situ energy-dispersive diffraction with synchrotron radiation. Within this high temperature regime, the oxidation kinetics and scale microstructure were not significantly different from those encountered in the oxidation of ferrous polycrystals. Thus, epitaxial strains did not determine the stress state within the oxide scale. Relevant sources of growth stresses were inferred to be volumetric differences between the iron oxides in the early stages, and later, inner oxide formation, scale consumption as well as pore formation. These sources caused time-dependent stress cycles in magnetite and wüstite during oxidation. In the hematite layer stress cycles did not occur and creep appeared to be the predominant stress relieving mechanism. On cooling, the differences in thermal expansion caused residual stress gradients through the oxide scale.

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“…FexO In wfistite (Fe~,O) the oxygen ions form a complete f.c.c, structure• However, the octahedral cation sites are partially filled by iron ions, the rest of the sites being vacant (Jette & Foote, 1933). In addition, there are iron ions in tetrahedral sites (Koch & Cohen, 1969); in what follows the two sets of tetrahedral sites are referred to as 'Tet 1' and 'Tet 2'.…”

Section: Applications To Specific Systemsmentioning

confidence: 99%

Equations for diffuse scattering from materials with multiple sublattices

Hayakawa¹,

Cohen²

1975

Acta Cryst Sect A

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General equations are presented for the diffuse scattering due to local ionic arrangements and displacements in systems with more than one ion per lattice point. Up to fourth-order terms are included. These are placed in a form easy to evaluate in specific cases; examples are given of a solid-solution oxide, and an oxide with vacant sites. Methods for employing these equations for the separation of the various contributions are discussed.

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An X-Ray Study of the Wüstite (FeO) Solid Solutions

Cited by 181 publications

References 4 publications

Metal organic framework-mediated synthesis of highly active and stable Fischer-Tropsch catalysts

Metal organic framework-mediated synthesis of highly active and stable Fischer-Tropsch catalysts

Evolution of Microstructure and Internal Stresses in Multi-Phase Oxide Scales Grown on (110) Surfaces of Iron Single Crystals at 650 °C

Equations for diffuse scattering from materials with multiple sublattices

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