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The interstitial oxygen O5 and the O1-O5 oxide-ion interstitialcy diffusion of Ba7Nb3.9Mo1 ...
In panel d, the contour lines from 0 to 2 fm/Å3 by the step of 0.2 fm/Å3. Arrows in panel c denote the directions of oxide-ion O1-to-O5 migration.