Abstract
YBa 2Cu 3O 7− x (YBCO) seed films were used to grow NdBa 2Cu 3O 7− x (NdBCO) superconducting films on MgO substrates by liquid phase epitaxy. The film microstructures were characterized using optical and electron microscopies to clarify the growth mechanism. It was found that most of the seed grains decomposed at the high processing temperature and dissolved when they touched the solution. The NdBCO grains were formed first by the quasi-homo-epitaxial growth of NdBCO units on the few surviving YBCO seed grains and then grew pendently to cover the large area of the bare MgO substrate surface region quickly by lateral overgrowth. A micrometer-thick melt layer was entrapped between the film and the substrate. Through the few links provided by the surviving seed grains, a stable film/substrate orientation relationship could still be maintained.
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