The crystal structure of a new 84 K superconductor, Bi4Sr4CaCu3O14+x

✍ Scribed by Yu.F. Shepelev; A.A. Levin; Yu.I. Smolin; A.A. Bush; B.N. Romanov

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 265 KB
• Volume: 215
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90237-k

✦ Synopsis

The crystal structure of a new superconductor in the Bi-Sr-Ca-Cu oxide system of nominal composition Bi4Sr4CaCu3Oi4 has been studied by single crystal X-ray diffraction. A modulation was observed along the b-axis. The structure of the fundamental unit cell has been determined in orthorhombic space group Pbmm, a=5.411 (2), b=5.417(3), c=27.75(1 ) A, Z=2. The final R-factor is 0.067 for 167 unique reflections collected up to 20= 60* with Ag Kit radiation. The essential feature of the structure is the existence of two kinds of copper--oxygen layers with square-pyramidal (CuO3-1ayer) and square-dipyramidal (CuO4-1ayer) oxygen coordinations of the Cu atoms. Two perovskite-like blocks [Sr-CuO3-Ca-CuO3-Sr] and [Sr-CuO4-Sr ] are alternated by double [BiO ] 2 layers. The bonds in the BiO planes form chains Bi-O-Bi extending along the b-axis.