Bulg. J. Phys. vol.28 no.5-6 (2001), pp. 238-245


Phase Composition and Superconducting Properties of (Pb0.6SnyCu0.4-y)Sr2(Y1-xCax)Cu2Oz

N. Balchev1, K. Nenkov2, B. Kunev3, A. Souleva4, Ts. Tsacheva5
1Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee Blvd, 1784 Sofia, Bulgaria
2Institut fur Festkorper und Werkstofforschung, 01171 Dresden, Germany
3Institute of Catalysis, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
4University of Chemical Technology and Metallurgy, 1756 Sofia, Bulgaria
5Institute of Physical Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
Abstract. The effect of Sn doping in (Pb0.6SnyCu0.4-y)Sr2(Y1-xCax)Cu2Oz for 0 y 0.8 and 0 x 0.7 was investigated. It was established that a nearly pure 1212 phase could be obtained at 0 y 0.1 and 0 x 0.3. The obtained XRD patterns as well as the results of the EDX and ICP-AES analyses showed that the Sn-substitution was possible in the (Pb,Cu)-1212 phase. Superconductivity was observed at 0.4 x 0.7. The onset of the diamagnetic transitions varied from 10 to 30 K. The influence of the strong Pb deficiency on the superconducting properties of the samples was discussed.

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