A new paradigm for modulated phases in multi-stage structural transformations

Details A new paradigm for modulated phases in multi-stage structural transformations A new paradigm for modulated phases in multi-stage structural transformations

2002-07-18

arxiv.org/abs/cond-mat/0207451v1

Physics

Condensed Matter

Materials Science

6 pages, 6 figures

Scientific paper

10.1103/PhysRevB.67.134113

For multi-stage, displacive structural transitions we present a general framework that accounts for various intermediate modulated phases, elastic constant, phonon and related thermodynamic anomalies. Based on the presence or absence of modulated phases we classify these transformations in four categories and apply this approach to four different representative materials: Ni-Mn-Ga, NiTi(Fe),Ni-Al, Cu-Zn-Al and alpha-U. We suggest that the anomalous increase in elastic constant(s) and phonon frequency observed when approaching the martensitic transition from above is a signature of the conmensurate modulated phase.

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