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摘要: 用X射线转靶衍射仪,详细地观察和分析了Bi2Sr2CaCu2Oy单晶的调制结构.指出布喇格反射的卫星峰是沿c*拉长的,与B心正交对称结构不相符的宽化峰正是由于这种拉长的结果,且导致卫星峰强度的不对称性.Bi-O层和钙钛矿层晶格失配形成的超晶格为非正交而是单斜的,并可能存在超晶格孪晶
Abstract: The modulated structure of Bi2Sr2CaCu2Oy single crystals has been observed and studied in detail with an X-ray rotating-anode diffractometer, indicating that the satellites of Bragg reflections are stretched along the c* direction in reciprocial space. It is the result of the stretch that the widened peaks are incompatible with a B-centered orthorhombic bravais lattice , and the intensities of satellites become asymmetry. The superlattice based on the lattice mismatch is not orthorhombic but monoclinic and perhaps forms superlattice twin structure in Bi-2212 single crystals.