Abstract
Seventeen members of the solid solution series Ba2-xSrxLuBiO6 have been prepared, and their crystal structures were studied using a combination of powder synchrotron X-ray and neutron diffraction methods. The oxides all adopt a double perovskite-type A2BB‘O6 (A = Ba, Sr; B = Lu, B‘ = Bi) structure as a consequence of ordering of the Lu3+ and Bi5+ cations. As the average ionic radius of the A-site cations (Ba/Sr) decreases the LuO6 and BiO6 polyhedra tilt and the structure changes from cubic Fm3̄m (0 < x < 0.375) through monoclinic I2/m (0.375 < x < 1.0) to monoclinic P21/n (1.0 < x < 2.0)
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