Abstract
We review our recent works on the positional disorder and diffusion path of oxide ions in Bi2O3, CeO2 and (La0.8Sr0.2) (Ga0.8Mg0.15Co0.05) O3-δ. These were studied through the nuclear density distribution obtained by a combined technique including a Rietveld refinement, a maximumentropy method (MEM) and MEM-based pattern fitting of the neutron powder diffraction data measured at high temperatures. Oxide ions in fluorite-type structured δ-Bi2O3 and CeO2 have a complicated disorder spreading over a wide area and shift to the ‹111› directions from the ideal fluorite site at higher temperatures. Diffusion path of oxide ions in (La0.8Sr0.2) (Ga0.8Mg0.15Co0.05) O3-δ perovskite is not along the straight line between the ideal positions, but exhibits an arc shape away from the B-site cation (Ga0.8Mg0.15Co0.05) .
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