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Twinning in Ba2YCu3O7-x crystals prepared by the standard sintering method was examined by electron optical methods. Under electron beam irradiation in a vacuum in an electron microscope, an orthorhombic crystal transformed irreversibly to a tetragonal form. Prior to the complete transformation, an “incipient” twinning state was observed. The incipient state is considered in terms of domain formation of a tetragonal form.
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Iijima et al. (1987) studied this question.
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