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Author Hatch, D. M. ♦ Hu, P. ♦ Saxena, A. ♦ Barsch, G. R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ CRYSTAL-PHASE TRANSFORMATIONS ♦ DOMAIN STRUCTURE ♦ ORDER PARAMETERS ♦ PHONONS ♦ PHASE STABILITY ♦ GROUP THEORY ♦ FERROELECTRIC MATERIALS ♦ TWINNING ♦ GRAIN BOUNDARIES ♦ DOMAIN WALLS
Abstract We present a group theoretic technique based on the concepts of the direction of the order parameter (OP) and the OP isotropy group to study systematically the interphase boundaries in materials undergoing displacive transitions and construct all independent OP gradient invariants, determine primary and secondary OP profiles, domain wall energy, stability, and the phonon dispersion in the vicinity of the soft mode wave vector. We illustrate the technique for an improper ferroelastic {ital O}{sup 1}{sub {ital h}}-{ital D}{sub 4{ital h}}{sup 17} transition driven by a soft {ital M}{sub 5}{sup {minus}} mode observed in alloys with CsCl structure. {copyright} {ital 1996 The American Physical Society.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-02-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 76
Issue Number 8


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