Ordered sigma-type phase in the Ising model of Fe-Cr stainless steel

Physical Review B - Condensed Matter and Materials Physics

Volumn 79, Issue 9, 2009, Pages

  Ackland, G J ^a  

^a UNIVERSITY OF EDINBURGH   (United Kingdom)

Author keywords

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Indexed keywords

EID: 65249094253     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.79.094202     Document Type: Article

References (52)

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51. Note that the sigma phase is not an ordered compound in the strict sense of having only one composition-both in the model and in real FeCr, there is a range of composition within which the sigma phase exists. In addition, the sigma phase is a complex phase with five sublattices, and configurational disorder exists on some sublattices: this does give rise to some configurational entropy but not of itself enough to stabilize the phase.
52. The interpretation of the additional entropy coming from paramagnetism should not be taken too literally. In such a simple model the σ degeneracy captures all spin, phonon, and electronic contributions to the excess entropy, while the p label incorporates all bonding contributions, including the implicit lattice rearrangement from B2 to sigma.