Abstract: Natural layered aluminosilicate kaolinite Al₄[Si₄O₁₀](OH)₈ was used as a starting material for perparing a new system of lithium fast ion conductors
Li_1+2x+yAl_xNd_yTi_2-x-ySi_xP_3-xO₁₂ by high temperature (800～1000℃) solid phase reaction for about 20h. A solid solution phase with R3c structure exists in a
limited composition region. The electrical measurements indicated that the maximum conductivity in the above system (referred to as Al-Nd-Lisicon) is
the initial composition with x=1.0, x=0.3, its conductivity reaches up to 3.08×10^-2S/cm at 400℃ and the activation energy is 35.2kJ/mol.

Key words: mineral fast ion conductors, Al-Nd-Lisicon, kaolinite