Abstract
The phase relationships and solid-solution region of the Bi 2Sr 2CaCu 2O 8+δ (2212) superconductor were investigated at 850°C under air atmosphere in a cross-section of the system BiSrCaCu(O) defined by the formula Bi 2+ y Sr 3− y− x Ca x Cu 2O 8+δ. The system was studied by means of XRD and EMA and an approximate position of the 2212 single-phase region is delimited by the values of y=0.1 and 0.8≤ x≤1.3. The single-phase region determined may be divided into two subregions, Sr-rich in the range 0.8≤ x≤1.0 and Ca-rich in the range 1.1≤ x≤1.3, these differing in the number and character of intergrowths. The highest superconducting transition temperature ( T c) was found for x=0.8.
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