Abstract
The mixed perovskites BaCa (1+ x)/3 Nb (2− x)/3 O 3− x/2 were investigated for x=0, 0.06, 0.12 and 0.18. The latter compound is the widely studied ceramic BCN18 which has served as a prototypical high temperature proton conductor in recent years. The ceramics with x=0.06 and 0.12 show a much lower solubility for water vapor. A linear increase in lattice parameter was observed when going from x=0 to 0.18. Density measurements supported the model of vacancies on the O-sublattice in the dry state. The volume of such a vacancy is close to that required by an O-atom.
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