A study was made of conductivity and phase transitions in Li-substituted materials. The results (table 181) demonstrated that a conductivity enhancement in various systems was associated with the formation of solid solutions that were based upon the substitution: M4+  4Li+.

J.Kuwano, N.Sato, M.Kato, K.Takano: Solid State Ionics, 1994, 70-71, 332-6

Table 181

Ionic Conductivity of Various Phosphates