Resistivity and magnetic susceptibility of superconducting Bi 0.25- y Sr 0.25- y Ca 2 y Cu 0.5 O x ( y =0.1, 0.125, 0.15) have been measured and compared with the results of X-ray powder diffraction. The volume fraction of the low- T c phase ( T c ∼75 K) decreases as the Ca concentration is increase...
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