Abstract
The phase relations in the doubly substituted Tl x Pb 1− x Sr y Ba 1− y O 3 system show a solubility range of the perovskite phase BaPbO 3 from x=0, y=0.5 to x=0.8, y=0. The crystallographic structure of the solid solution is well described with a tetragonal cell, I4/ mcm space group. The electrical conductivity shows a semiconducting behaviour with an activation energy of 7.2 kJ mol − in the temperature range 600–850°C. The Sr-based perovskite SrPbO 3, with orthorhombic Pbnm structure does not accept extended Tl or Ba substitutions.
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