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- W2069870903 abstract "A small amount of Co is doped in the starting mixtures for preparing YBa2Cu4Oy (1-2-4) type of superconductors and the resultant materials are examined by HRTEM, in order to examine the effects of Co substitution on the structural stability and perfections of the 1-2-4 structure. Up to about 2% substitution, the 1-2-4 phase is obtained as the major phase. The stability of (CuO)2 double-chains (D), however, decreases gradually with further substitutions and partial conversions of double-chains into (CuO) single-chains (S) are induced. With 3% substitution, domains of the 2-4-7 structure with (D S D S D) sequences are formed together with those of the 1-2-4 one with a (D D D D) sequence. Small domains of a new ordered structure (D D S D D S D D S) are also observed in Co 3% specimen, suggesting the existence of a new Y3Ba6 (Cu, Co)11Oy (3-6-11) phase. The stability of the 2-4-7 phase increases by further substitution and, finally, it becomes the major phase at a 5% substitution by Co." @default.
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- W2069870903 date "1991-11-01" @default.
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- W2069870903 title "High-resolution transmission electron microscope study of effects of cobalt substitution on the stability and perfection of YBa2Cu4Oy superconductors" @default.
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- W2069870903 doi "https://doi.org/10.1016/0921-4534(91)90563-e" @default.
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