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The orthorhombic phase of the high Tc superconductor (Ln)Ba2Cu3O6+A is observed in transmission electron microscopy. This phase is ferroelastic and exhibits two different orientation domains. A full description of the twin boundaries is given. The behaviour of the ferroelastic domains at the intersection of orthogonal twin walls is more particularly investigated.
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Snoeck et al. (1989) studied this question.
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