Congruent LiNbO3 (CLN)undoped or slightly doped CLN
P-comp1×10−16 to 1×10−14S/m
T room temperature, extrapolated from high temperature; default record
Protonic conduction; activation energy about 1.1 eV (200-1000 C). 8-10 orders of magnitude below the 1.0e-6 S/m floor fitted in Bouchy et al. 2022.
Volk & Wöhlecke, Springer Series in Materials Science 115 (2009), Sec. 3.2.1, pp. 59-60 (1e-16 to 1.0e-18 Ohm^-1 cm^-1)