Single-phase region of the 2212-BiSrCaCuO superconductor
1993; Elsevier BV; Volume: 216; Issue: 1-2 Linguagem: Inglês
10.1016/0921-4534(93)90656-b
ISSN1873-2143
AutoresK. Knı́žek, E. Pollert, David Sedmidubský, J. Hejtmánek, J. Prachařová,
Tópico(s)Advanced Condensed Matter Physics
ResumoThe phase relationships and solid-solution region of the Bi2Sr2CaCu2O8+δ (2212) superconductor were investigated at 850°C under air atmosphere in a cross-section of the system BiSrCaCu(O) defined by the formula Bi2+ySr3−y−xCaxCu2O8+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 (Tc) was found for x=0.8.
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