Structural characterization and electrical resistance of the BaPb1-xBixO3 system

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Author(s):	da Luz, M. S. ; Coelho, A. D. A. ; dos Santos, C. A. M. ; Izario Filho, H. J. ; Machado, A. J. S. Total Authors: 5
Document type:	Journal article
Source:	MATERIALS SCIENCE-POLAND; v. 28, n. 3, p. 7-pg., 2010-01-01.
Abstract
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 superconductivity 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 (T-C) 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. (AU)