Twin wall of cubic-tetragonal ferroelastics

Details Twin wall of cubic-tetragonal ferroelastics Twin wall of cubic-tetragonal ferroelastics

2000-04-24

arxiv.org/abs/cond-mat/0004387v1

Phys. Rev. B 62, R11925-R11928 (2000)

Physics

Condensed Matter

4 pages (revtex), 3 figures

Scientific paper

10.1103/PhysRevB.62.R11925

We derive solutions for the twin wall linking two tetragonal variants of the cubic-tetragonal ferroelastic transformation, including for the first time the dilatational and shear energies and strains. Our solutions satisfy the compatibility relations exactly and are obtained at all temperatures. They require four non-vanishing strains except at the Barsch-Krumhansl temperature TBK (where only the two deviatoric strains are needed). Between the critical temperature and TBK, material in the wall region is dilated, while below TBK it is compressed. In agreement with experiment and more general theory, the twin wall lies in a cubic 110-type plane. We obtain the wall energy numerically as a function of temperature and we derive a simple estimate which agrees well with these values.

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