Rare earth mineral fast ion conductors of Li 1+2 x+3y Al x Sc y Zn y Ti 2- x-2y Si x P 3- x O 12 system based on LiTi 2(PO 4) 3 were prepared by solid phase reaction at high temperature (1000～1300 ℃) for about 30 h using refined natural kaolinite and Sc 2O 3. The X ray diffraction analysis shows that a Nasicon like structure with R3c space group can be found in the composition range of x =0.1, 0.2, y ≤0.2. The maximum lithium ion conductivity is 1.19×10 -4 S·cm -1 for the composition with x =0.1, y =0.08 at room temperature, and its activation energy is 30.6 kJ·mol -1 in the temperature range of 150～300 ℃. The systems with these compositions have high conductivity of about 10 -2 S·cm -1 at 300 ℃.
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