Abstract

A new series of compounds of composition (Ba 1- x Sr x ) 2(Sr 0.67Bi 0.33)(Pb 1- y Bi y )O 6-δ has been prepared and characterized by powder X-ray and neutron diffraction studies. The phases adopt the cubic (NH 4) 3FeF 6 type structure (space group Fm3 m) with Sr 2+ ions occupying the B sites. TGA and neutron refinements show oxygen vacancies and a large anisotropy associated with the O atoms. The anisotropy is discussed in terms of a vacancy model.

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