Abstract

Bi 2 Sr 2 CuO 6 – CaCuO 2 system is studied in a wide range of compositions by electrical resistivity and X-ray diffraction measurements. The T c = 80 K phase can be observed in all compositions except the Ca free Bi 2 Sr 2 CuO 6, while the T c = 110 K phase is characteristic to the high CaCuO 2 concentration range, with maximum intensity at the nominal composition of Bi 2 Sr 2 Ca 2 Ca 5 Cu 6 O 16. The distribution of 20 K, 80 K and 110 K T c phases is estimated from powder X-ray measurements.

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