Table 1.

Proton conductivities of a single crystal in variable orientation, as indicated by the schematic (22 °C, 90 % r.h.).

Orientation	Proton conductivity σ [S cm−1]
parallel (0°)	1.174 ⋅ 10−5
angled (60°)	8.924 ⋅ 10−5
perpendicular (90°)	1.142 ⋅ 10−4