Conductivity data for monocrystalline and cold-pressed polycrystalline samples demonstrated that Cu+ ion migration predominated at temperatures ranging from 25 to 300C in Ar. Both sets of samples exhibited fully reversible Arrhenius-type conductivity, with an activation energy of about 0.45eV and typical conductivity values of about 0.0019S/cm at 186C. The conduction appeared to be 1-dimensional.

E.Freudenthaler, A.Pfitzner, D.C.Sinclair: Materials Research Bulletin, 1996, 31[2], 171-6