Subsolidus phase relations in the system (Bi-Sr-Ca-Cu)-0 at 800°C were investigated via powder X-ray diffraction and electron probe microanalysis of solid-state reaction products. Two recently reported (Bi-Sr-Ca)-0 phases were detected in quaternary assemblages and had the approximate cation stoichiometries of 9115 and 825. The only truly quaternary compound detected is the superconducting phase with the cation stoichiometry 2212. Tie lines, tie triangles, and compatibility tetrahedra involving this phase and the 2201 superconducting phase were determined. Both superconducting compounds exhibit small but detectable Sr-to-Ca solubility and are Sr-deficient with respect to the "ideal'' formulas. [
Solid-phase relationships have been determined for the Bi203-Sr0-Cu0 system at 800°C in air with and without Li2C03 mineralizer. Two ternary compounds were detected with Bi : S r :Cu ratios of approximately 2 : 2 : I and a solid-solution phase I 1 -x:9+x:5 with 0 1~1 0 . 4 . The solid-solution phase is a 9 K superconductor at x =0.4. Two additional compounds with Bi:Sr:Cu ratios of approximately 4:9:1 and 2:7:2 are apparently stabilized by the presence of Li2C0,, but do not form without it. X-ray crystallographic data are provided for each compound. Ramifications for quaternary Bi :Sr :Ca : Cu-0 superconductors are discussed. [
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