Structure and composition of the 115 K superconducting phase in the Bi-Ca-Sr-Cu-O system

Ramesh, R.; Thomas, G.; Green, S. M.; Rudee, M. L.; Luo, H. L.
August 1988
Applied Physics Letters;8/8/1988, Vol. 53 Issue 6, p520
Academic Journal
Results of convergent beam electron diffraction and energy dispersive x-ray (EDX) microanalysis of Bi1.2Ca0.9Sr0.9Cu2Oy superconductor are reported. The structure is orthorhombic with a=5.63 Ã…, b=5.4 Ã…, and c=38.2 Ã…. The c parameter is different from those reported by other workers and suggests that two extra perovskite units ap, where ap=3.82 Ã…, have been introduced leading to c=10ap. EDX microanalysis shows that the Cu content of this phase is higher than that reported by other workers. It is suggested that the phase with c=38.2 Ã… may be the higher temperature (115 K) superconductor.


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