Abstract
Crystal structure and effects of Fe doping of a non-superconducting phase (B-phase) in the Bi-Sr-Cu-O system are examined by electron-diffraction and high-resolution transmission electron microscope measurements. The B phase has a long-range periodic structure closely related to the modulated structure of the superconducting phase and it crystallizes in a monoclinic superlattice with a s =0.54, b s =2.0, c s =2.5 nm and α=104°. The (BiO) 2 double layer is not a complete continuous sheet but suffers from a periodic displacement along the c-direction to form a terraced (BiO) 2 layer. Each BiO terrace consists of seven Bi atoms, and at every eighth lattice plane a vertical shear plane containing few Bi atoms is inserted. Fe doping has an effect on the periodicity of the terraced structure. Intergrowth of narrow (BiO) 2 terraces is induced in crystals doped with Fe.
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