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- W1997004997 abstract "Phase equilibria of the quasi-quaternary system BiO1.5–SrO-YO1.5–CuO have been studied at a temperature of 950°C in air, with special regard to the 1212 phase. The 1212 phase reveals only very small changes in the cation ratio. Single-phase samples exist for (Bi0.24–0.36Cu0.42-0.55)–Sr2Y1.27Cu2Oy compositions. The bismuth-rich composition of the 1212 phase is in thermodynamic equilibrium with a liquid and the 2212 phase, whereas the copper-rich composition is in equilibrium with five other phases. The influence of combined calcium and lead doping also has been studied. Exceeding the calcium saturation of the 1212 phase increases the amount of 2212 as a secondary phase. Single-phase 1212 samples do not show any superconductivity in either the as-prepared or the post-annealed state. The only compositions with bulk superconductivity are those with calcium and lead doping after annealing at a temperature of 980°C. The superconductivity is attributed to the 2212 phase crystallizing from the melt during slow cooling." @default.
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- W1997004997 date "2004-12-22" @default.
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- W1997004997 title "Phase Equilibria and Superconducting Properties of BiSr2YCu2O7 (1212 Phase)" @default.
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- W1997004997 doi "https://doi.org/10.1111/j.1151-2916.1999.tb01741.x" @default.
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