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Superconductivity in the high- Tc Bi-Ca-Sr-Cu-O system: Phase identification
Robert M. Hazen (Johns Hopkins University, Carnegie Institution for Science), C. T. Prewitt (Johns Hopkins University, Carnegie Institution for Science), Ross John Angel (Johns Hopkins University, Carnegie Institution for Science), Nancy L. Ross (Johns Hopkins University, Carnegie Institution for Science), Larry W Finger (Johns Hopkins University, Carnegie Institution for Science), C. G. Hadidiacos (Johns Hopkins University, Carnegie Institution for Science), David R. Veblen (Johns Hopkins University, Carnegie Institution for Science), Peter J. Heaney (Johns Hopkins University, Carnegie Institution for Science), P. H. Hor (Johns Hopkins University, Carnegie Institution for Science), R. L. Meng (Johns Hopkins University, Carnegie Institution for Science), Yanyi Sun (Johns Hopkins University, Carnegie Institution for Science), Y. Q. Wang (Johns Hopkins University, Carnegie Institution for Science), Y. Y. Xue (Johns Hopkins University, Carnegie Institution for Science), Z. J. Huang (Johns Hopkins University, Carnegie Institution for Science), Li Gao (Johns Hopkins University, Carnegie Institution for Science), Jeff Bechtold (Johns Hopkins University, Carnegie Institution for Science), C. W. Chu (Johns Hopkins University, Carnegie Institution for Science)
Résumé : Four phases are observed in superconducting Bi-Ca-Sr-Cu-O samples. The superconducting phase, with onset temperature near 120 K, is a 15.4-A\r{}-layered compound with composition near ${\mathrm{Bi}}_{2}$${\mathrm{Ca}}_{1}$${\mathrm{Sr}}_{2}$${\mathrm{O}}_{9}$ and an A-centered orthorhombic unit subcell 5.41\ifmmode\times\else\texttimes\fi{}5.44\ifmmode\times\else\texttimes\fi{}30.78 A${\r{}}^{3}$. X-ray diffraction and electron microscopy data are consistent with a structure of alternating perovskite and ${\mathrm{Bi}}_{2}$${\mathrm{O}}_{2}$ layers. High-resolution transmission electron microscopy images reveal a b-axis superstructure of 27.2 A\r{}, numerous (001) stacking faults, and other defects.