Abstract
The infinite-layer phase existing in the compounds with composition Sr 1−xRe xCuO 2 (Re=Pr, La) synthesized under high pressure has been investigated by high-resolution transmission electron microscopy as well as selected-area electron diffraction techniques. A few stacking faults with a/2 shear vectors occuring in the (1, 0, 0) or (0, 1, 0) planes as well as a local superstructure, caused by ordering of La-atoms, are observed in the infinite-layer phase with composition Sr 0.97La 0.03CuO 2. Two additional phases coexisting in the compound Sr 0.87Pr 0.13CuO 2 have also been identified. The first of these is an incommensurate phase with cell parameters a=11.5 Å, b=13.0 Å and c=4.0Å it contains an approximately seven-fold structural modulation along the c-axis. The second phase has cell parameters a=3.86 Å, b=11.6 Å and c=20.4 Å. The remaining compounds investigated also contain up to three phases. A possible structural model for the incommensurate phase is suggested, and the calculated images obtained with this model yield an excellent fit with the experimental observations.
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