The Fe-O (iron-oxygen) phase diagram in the range of the nonstoichiometric monoxide and magnetite at the Fe-rich limit: Reduction diagrams

Vallet, Pierre; Carel, C.

doi:10.1007/bf02877494

Cited by 12 publications

(13 citation statements)

References 23 publications

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“…[15]) it was proposed to subdivide the wüstite field into ten regions separated by transformations of second (or higher) order. These structural changes have not been detected by other authors who worked within the stability field of wüstite and Vallet's findings remain controversial.…”

Section: Wüstitementioning

confidence: 99%

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Thermodynamic reevaluation of the Fe–O system

Hidayat

Shishin

Jak

et al. 2015

Calphad

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Section: Wüstitementioning

confidence: 99%

“…10. [15,36,37,41,42,45,[52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67] and calculated lines. The calculated oxygen isobars are shown by the dashed lines.…”

Section: Phase Diagramsmentioning

confidence: 99%

Thermodynamic reevaluation of the Fe–O system

Hidayat

Shishin

Jak

et al. 2015

Calphad

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“…In the Fe-O system, iron monoxide or wiistite shows a particularly large deviation from stoichio-0108-7681/91/030333-05503.00 metry and a complex behavior under equilibrium conditions at high temperature (Vallet & Carel, 1989). This is why many previous structural studies (Koch & Cohen, 1969;Cheetham, Fender & Taylor, 1971;Catlow & Fender, 1975;Gavarri, Carel & Weigel, 1979;Gavarri, Carel, Jasienska & Janowski, 1981;Gartstein, Mason & Cohen, 1986) have been performed on this material at high temperature or after quenching.…”

Section: Introductionmentioning

confidence: 99%

The commensurate (10/4) cluster model in quenched wüstite P''. New simulation of HREM direct images

Nihoul¹,

Gavarri²,

Carel³

1991

Acta Crystallogr Sect B

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In the case of non-stoichiometric quenched wfistite P" with the formula Fel-zO (z = 0.096), the defect structure is shown to consist most probably of clusters composed of ten vacancies and four interstitial Fe III ions. These clusters are in agreement with a long-range ordering (2.5X, 2.5X, 5)0, with some disorder in their local arrangement. The direct im~iges of the quenched phase P", previously obtained by various authors, are reinterpreted from a (10/4) cluster model: computer simulations have been carried out using this new model. The simulated images are in good agreement with the experimental images found in the literature.

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“…when he determined experimentally the external boundaries of the stable domain of ferrous oxide considered to be the daltonide 'FeO' [25]. Point C is at the intersection of the two boundaries, where three solid phases (Fe, Fe3O4 and 'FeO') coexist at equilibrium at 570°C, temperature that has been revised particularly by Raccah, Vallet, Carel [26][27][28][29], and that is named Chaudron's point.…”

Section: Early Work (1921-1961)mentioning

confidence: 99%

The complex nonstoichiometry of wüstite Fe1-O: Review and comments

Gavarri

Carel

2019

Progress in Solid State Chemistry

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Thermodynamic properties and structural aspects of the nonstoichiometric wüstite Fe 1-z O, and its modificationsthe so-called pseudo-phases -as functions of departure z from stoichiometry and of equilibrium temperature are reviewed from 1960 to present. The complexity of the equilibrium phase diagram is described in some details. The first order transition W W' is specified on the iron / wüstite boundary near 1185 K. Transitions correlated to the modifications Wi at T(W)>1185 K and W'j at T(W') <1185 K (i and j =1,2,3) are re-examined. Structural determinations based on the characterization of point defects stabilization and of their clustering are reviewed. Additionally, the pseudo-phases are examined based on the transformation of defect clusters or of their mode of distribution (i.e., percolation or superstructure) with the inclusion of changes in electronic charge carriers.

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The Fe-O (iron-oxygen) phase diagram in the range of the nonstoichiometric monoxide and magnetite at the Fe-rich limit: Reduction diagrams

Cited by 12 publications

References 23 publications

Thermodynamic reevaluation of the Fe–O system

Thermodynamic reevaluation of the Fe–O system

The commensurate (10/4) cluster model in quenched wüstite P''. New simulation of HREM direct images

The complex nonstoichiometry of wüstite Fe1-O: Review and comments

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