Abstract
The initial stage of growth for YBa 2Cu 3O x (Y123) films on (100) MgO substrates by liquid phase epitaxy (LPE) was investigated. In the initial stage, Y123 seed films partially dissolved into BaO–CuO solution, and Y123 islands were epitaxially grown from the undissolved seed grains on an MgO substrate within 1 s. It was found by XRD analysis that the LPE films with grain orientation of fourfold symmetry on the surface of MgO substrate were grown from not only a fourfold symmetrical seed film but also an eightfold symmetrical one. This phenomenon cannot be fully explained by the coarsening mechanism due to the curvature difference. The difference in the interface energies between Y123 and MgO should be considered to understand the preferential dissolution and growth.
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