Abstract
We employed transmission electron microscopy (TEM) and single crystal X-ray diffraction techniques, supplemented by differential thermal and thermo-gravimetric analysis (DTA, TG) and high temperature powder X-ray diffraction, to study microtwinning in orthorhombic crystals of the high-T c superconductor YBa2Cu3O8−x (x≅1.0). This twinning is associated with a structural phase transition at 750°C from a tetragonal high temperature phase (s.g.P4/mmm) to the orthorhombic ambient temperature phase (s.g.Pmmm) and seems to be inherent to virtually all orthorhombic crystals of YBa2Cu3O8−x . The domain size ranges from typically 100 Å to 1000 Å. All our observations are compatible with a twin law where the tetragonal (110)-mirror plane is the twin element.
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Roth, G., Ewert, D., Heger, G. et al. Phase transformation and microtwinning in crystals of the high-T c superconductor YBa2Cu3O8−x ,x≅1.0. Z. Physik B - Condensed Matter 69, 21–27 (1987). https://doi.org/10.1007/BF01560605
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DOI: https://doi.org/10.1007/BF01560605