Rietveld analysis of the composite crystal in superconducting Bi2+xSr2−xCuO6+y

✍ Scribed by Akiji Yamamoto; Eiji Takayama-Muromachi; Fujio Izumi; Tōru Ishigaki; Hajime Asano

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 518 KB
• Volume: 201
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90115-s

✦ Synopsis

The modulated crystals of Bi-based superconducting oxides are well described as composite crystals [Walker and Que, Phys. Rev. B 45 (1992) 14 ]. The structure of the superconducting oxide Bi2+xSr2_xCuO6+y was analyzed for the first time as composite crystal by the Rietveld method with the combined use of X-ray and TOF neutron diffraction data. It consists of two interpenetrating one-dimensionally modulated structures with the superspace groups NB~/~ and p~/m. The analysis revealed large atomic displacements from average positions in the Bi-O, Sr-O, Cu-O layers. The oxygen arrangement in the Bi-O layer is similar to that in Bi2+x (Sr, Ca)3_xCu2Os+r.