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1 2010

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Structural characterization and electrical resistance of the BaPb1-xBixO3 system

Da Luz M. S., Coelho A. D. A., Dos Santos C. A. M., Izario Filho H. J., Machado A. J. S.

Materials Science Poland

2010

Vol. 28, No. 3

639--645

The electrical resistance R(T) in function of temperature T, and X-ray powder diffraction (XRD) patterns of polycrystalline samples of the BaPb1-xBixO3 system have been described. R(T) measurements of single phase samples show that BaPbO3 exhibits metal-like properties, and that the system exhibits super-conductivity in the 0.005 < x < 0.30 range, but insulating properties for x > 0.30. A careful analysis of the onset of the critical temperature (TC) reveals its strong dependence on the sample composition in the range 0.005 < x < 0.30 which may be related to the superconducting volume fraction ultimately leading to connected or disconnected superconducting clusters, similar to those observed in granular superconductors.