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- W2016074296 abstract "We have studied the influence of Fe impurities in the superconducting compound Bi-Sr-Ca-Cu-O prepared from two basic nominal compositions Bi 2 Sr 2 Ca(Cu 1− x Fe x ) 2 O 8+δ and Bi 4 Sr 3 Ca 3 (Cu 1− x Fe x ) 4 O 16+δ . The superconducting and secondary phases have been analyzed by SEM, EPMA, HREM and X-ray diffraction. The composition of the doped superconducting phase is best described by the formula: Bi 2+ y (Sr, Ca) 3 (Cu 1− x Fe x ) 2− y O 8+δ , where y increases as a function of x ( x < 0.16). Electron microscopy analysis also reveals the presence of a new monoclinic structure, with a particular orientation relationship with the basic 2212 structure. Annealing of the samples in a poor oxygen atmosphere improves the T c values of the doped samples. The downward shift of T c for increasing Fe content follows a linear relationship with a slope of 5 K/(Fe/Fe+Cu) at.%. The importance of the Bi-O-Cu-O electron coupling in the superconductivity mechanism is discussed." @default.
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- W2016074296 date "1990-06-01" @default.
- W2016074296 modified "2023-09-27" @default.
- W2016074296 title "Superconductivity and microstructure in Fe-doped Bi-Sr-Ca-Cu-O compounds" @default.
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- W2016074296 doi "https://doi.org/10.1016/0921-4534(90)90515-g" @default.
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