Visualization of the diffusion path in the fast oxide-ion conductor Bi1.4Yb0.6O3

Accurate nuclear-density distribution of bismuth oxide solution Bi1.4Yb0.6O3 compound has been studied at 384 °C and at 738 °C by the maximum-entropy method (MEM) and MEM-based pattern fitting combined with the Rietveld method using neutron powder diffraction data. The results reveal that the oxide ions have a complicated disorder spreading over a wide area, shift to the ⟨111⟩ directions from the ideal fluorite position and diffuse along the ⟨100⟩ directions.