Lithium ion conducting glass ceramics composed of the crystalline conductive phase Li1.4Al0.4(Ge1−xTix)1.6(PO4)3 (x = 0 to 1.0) with the Nasicon-type structure were synthesized and characterized by DTA, X-ray diffraction, field emission scanning electron microscopy and complex impedance techniques. The experimental results indicated that the glass ceramics were mainly composed of solid solution Li(Ge1−xTix)2(PO4)3 formed by LiGe2(PO4)3 and LiTi2(PO4)3 in the whole x range and exhibited conductivity over 10−4S/cm at room temperature. The maximum room temperature lithium ion conductivity of 6.21 x 10−4S/cm with an activation energy as low as 0.32eV was obtained for the Li1.4Al0.4(Ge0.67Ti0.33)1.6(PO4)3 treated at 950C for 18h. The high conductivity, good chemically stability and easy fabrication of the Li1.4Al0.4(Ge1−xTix)1.6(PO4)3 system suggested that they were promising solid electrolytes.

Lithium Ion Conductive Glass Ceramics in the System Li1.4Al0.4(Ge1−xTix)1.6(PO4)3 (x = 0–1.0). X.Xu, Z.Wen, Z.Gu, X.Xu, Z.Lin: Solid State Ionics, 2004, 171[3-4], 207-13