Rüscher, C. H.; Debnath, T.; Fielitz, P.; Ohmann, S.; Borchardt, G. 18O/16O/Exchange/Studies/in/Bi2/(GaxAl1−x)4O9:/Oxygen/Diffusion/Coefficients/Estimated/from/Infrared/Absorption/and/XRD/Powder/Data. diffusion 2010, 12.