Anomalous ionic conductivity in NASICON monocrystals at about 200C was reported for the first time. A non-linear behavior of the lattice parameters, when near to this temperature, was also observed. The results were explained in terms of static disordering of the rigid skeleton, and possible deviations from the stoichiometric composition.

A.K.Ivanov-Shitz, A.B.Bykov, I.A.Verin: Kristallografiya, 1996, 41[6], 1060-2 (Crystallography Reports, 1996, 41[6], 1007-9)