The site-incorporation mechanism of M 3+ dopants into A 2+ B 4+ O 3 perovskites controls the overall defect chemistry and thus their transport properties. For charge-balance reasons, incorporation onto the A 2+ -site would require the creation of negatively charged point defects (such as cation vacancies), whereas incorporation onto the B 4+ -site is accompanied by the generation of positively charged defects, typically oxygen vacancies. Oxygen-vacancy content, in turn, is relevant to proton-conducting oxides in which protons are introduced via the dissolution of hydroxyl ions at vacant oxygen sites. We propose here, on the basis of x-ray powder diffraction studies, electron microscopy, chemical analysis, thermal gravimetric analysis, and alternating current impedance spectroscopy, that nominally B-site doped barium cerate can exhibit dopant partitioning as a consequence of barium evaporation at elevated temperatures.