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The angular dependences of the free energy, thickness and stresses are calculated for the antiphase boundaries (APBS) parallel to the tetragonal z axis but otherwise arbitrarily oriented. The general results are applied to Hg 2 Br 2 and KSCN. The APB in the former case is shown to decay into two ferroelastic domain walls, while it is stable in KSCN. High stresses occur around the APB in KSCN and more than 50% of the free energy originates from the inhomogeneous strain in the wall. The observed etched patterns in KSCN are discussed.
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Rychetský et al. (1993) studied this question.
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