Abstract
Measurements of electrical resistivity, Hall coefficient, lattice parameter for the system (Ba 1−xSr x)PbO 3−δ(0.0 ≤ x ≤1.0) were carried out. This system is orthorhombic and probable space groups in 0.0 ≤ x ≤ 0.5 and 0.5 ≤ x ≤ 1.0 are Imma and Pbnm, respectively. The resistivity increases with x and metallic behavior disappears at x = 0.5. The carrier concentration decreases with x and decreases rapidly in x ≥ 0.5. The mobility of electrons in this system shows a minimum at x = 0.5, being correlated with the randomness of A-site containing ions with different sizes. These electric properties are considered to be closely related with the tilting of PbO 6 octahedra, affecting the overlap between orbitals Pb 6s and O 2p which is the origin of the metallic conductivity of this system.
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