Dislocation configurations in twin-free melt-textured YBa2Cu3O7 processed at high pressure and temperature |
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| Authors: | A Joulain F Sandiumenge N Vilalta T Prikhna A V Vlasenko J Rabier |
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| Institution: | 1. Laboratoire de Métallurgie Physique, UMR 6630 CNRS , Université de Poitiers , SP2MI, BP 30179, F-86 962 Futuroscope Cedex, France anne.joulain@univ-poitiers.fr;3. Institut de Ciència de Materials de Barcelona CSIC , Campus de la Universitat Autònoma de Barcelona , 08193 Bellaterra, Catalunya, Spain;4. Institute for Superhards Materials , 2 Avtozavodskaya Strasse, 04074 Kiev, Ukraine;5. Laboratoire de Métallurgie Physique, UMR 6630 CNRS , Université de Poitiers , SP2MI, BP 30179, F-86 962 Futuroscope Cedex, France |
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| Abstract: | Melt-textured YBa2Cu3O7 samples were deformed under high pressure–high temperature (HP–HT) conditions (P?=?2?GPa, T?=?900 and 800°C, t?=?15?min). During the HP–HT treatment, samples were in contact with annealed zirconia, preventing oxygen loss, in such a way that the orthorhombic superconductor phase was preserved at the end of the experiment. The deformed microstructure, investigated by transmitted electron microscopy, exhibited original features characterized by a very low twin density, a memory effect on the dislocations shape and a non-classical faulted loops distribution in the matrix. A mechanism, based on the interaction between twin and gliding dislocations, is proposed to explain the nucleation of these aligned loops. |
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