A review about wüstite Fe 1-z O, pseudo-phases and defect clustering

Abstract : Thermodynamic properties and structural aspects of the non-stoichiometric wüstite Fe 1-z O, and its modifications-the so-called pseudo-phases-as functions of composition z and equilibrium temperature are reviewed from 1960 to present (159 references). The focus is first put on the complexity of the equilibrium phase diagram. The first order transition W <==> W' is specified on the boundary iron/ wüstite close to 1185 K. Transitions correlated to the modifications Wi at T(W) > 1185 K and W'j at 1185K < T(W') < T(W) (i and j =1,2,3) are reexamined. Structural determinations based on point defects and their clustering are recalled. A series of equilibria are developed, trying to justify the stabilization of the pseudo-phases, which can be interpreted in terms of transformation of defect clusters, or their mode of distribution (percolation, superstructure) including changes in electronic charge carriers.
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Submitted on : Tuesday, February 13, 2018 - 8:01:39 AM
Last modification on : Wednesday, May 16, 2018 - 11:23:30 AM

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  • HAL Id : hal-01659994, version 2
  • ARXIV : 1712.03741

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Jean-Raymond Gavarri, Claude Carel. A review about wüstite Fe 1-z O, pseudo-phases and defect clustering. 2017. ⟨hal-01659994v2⟩

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