Abstract
The YBa 2Cu 4O 8 to YBa 2Cu 3O 7 transformation in mixed phase, superconducting YBaCuO is investigated by high resolution transmission electron microscopy and static lattice, three dimensional, Monte Carlo computer simulations. Micrographs reveal dislocations and stacking faults associated with the transformation that are accurately predicted by the calculations and seen in “snapshots” of the simulated structures. An atomic mechanism involving the intercalation of extra CuO planes by partial dislocation climb is proposed for the YBa 2Cu 4O 8 YBa 2Cu 3O 7 phase change.
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