Abstract
We have constructed a Landau-Ginzburg model of ferroelastic domain walls in the tetragonal phase of CsCl-type intermetallic compounds. This improper ferroelastic phase transition is driven by the condensation of a degenerate zone-edge phonon mode of M 5 - symmetry and can be described by a six-component order parameter. Analytic and numerical kink-type soliton solutions for the order parameter profile and the strain distribution are obtained for three different interphase boundaries : a twin boundary and two antiphase boundaries. The stability, merging and splitting of various domain types are also studied. Specifically, a symmetry-allowed product phase of [4/mmm (D 4h 17 ) symmetry has been experimentally observed in pseudobinary rare earth alloys of composition RAg 1-x ln x (R=La, Ce, Pr) and in related systems (YCu, LaCd).
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