Variable temperature neutron diffraction study of crystal structure and transport pathways in oxide ion conductors Bi12.5Ln1.5ReO24.5 (Ln=Lu, Er)
Abstract Samples of highly conducting Bi 12.5 Lu 1.5 ReO 24.5 and Bi 12.5 Er 1.5 ReO 24.5 have been studied by neutron powder diffraction at room temperature for both phases and at 25 °C ≤ T ≤ 500 °C in the case of Bi 12.5 Er 1.5 ReO 24.5 . Both materials crystallize in the cubic δ-Bi 2 O 3 related system, space group Fm-3m. Changes in the oxygen sublattice at 25 °C ≤ T ≤ 500 °C have been investigated by the Rietveld and maximum entropy methods.