Landau-Ginzburg Model of Interphase Boundaries in CsCl-Type Ferroelastics due to M-5 Mode Instability : LaAg1-xInxReport as inadecuate




Landau-Ginzburg Model of Interphase Boundaries in CsCl-Type Ferroelastics due to M-5 Mode Instability : LaAg1-xInx - Download this document for free, or read online. Document in PDF available to download.



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 14-mmm D174h symmetry has been experimentally observed in pseudobinary rare earth alloys of composition RAg1-x Inx R=La, Ce, Pr and in related systems YCu, LaCd.





Author: D. Hatch P. Hu A. Saxena G. Barsch

Source: https://hal.archives-ouvertes.fr/



DOWNLOAD PDF




Related documents