Abstract
The superconducting Bi 2Sr 2CaCu 2O 8+ x (Bi-2212) phase has been deposited by halide CVD on two different substrate materials, MgO(001) and SrTiO 3(001). Metal iodides and oxygen were used as precursors. The films grew with a strong [001] orientation and only the 00 l reflections with l=2 n were observed. The in-plane orientational relationships were determined by TEM to be [100] MgO//[100] Bi-2212 and [100] MgO//[110] Bi-2212 for the MgO(001) substrate and [100] SrTiO3//[110] Bi-2212 for the SrTiO 3(001) substrate. The interfacial regions of the two substrate materials were investigated by cross sectional HREM, revealing that the interface is nearly atomically abrupt for both substrate materials. The first atomic layer of the films were found to be a BiO layer.
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