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Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x Y y Ti 1-2 y Nb y O 3 system were prepared by solid state reaction. X Ray powder diffraction shows that a single phase perovskite solid solution with orthorhombic structure forms in the ranges of x =0.10, y <0.075. Over this composition range the another phase, Y 2O 3 hexagonal phase is found. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of the order of 10 -4 S·cm -1 and 10 -5 S·cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of about 20 kJ·mol -1 and total activation energies of about 40 kJ·mol -1 in the temperature range of 298～523 K, respectively.
Perovskite type lithium fast ion conductors of Li 3 x La 0.67- x Y y Ti 1-2 y Nb y O 3 system were prepared by solid state reaction. X Ray powder diffraction shows that a single phase perovskite solid solution with orthorhombic structure forms in the ranges of x = 0.10, y <0.075. Over this composition range the another phase, Y 2O 3 hexagonal phase is found. AC impedance measurements indicate that the bulk conductivities and the total conductivities are of the order of 10 -4 S · cm -1 and 10 -5 S · cm -1 at 25 ℃ respectively. The compositions have low bulk activation energies of about 20 kJ · mol -1 and total activation energies of about 40 kJ · mol -1 in the temperature range of 298 ~ 523 K, respectively.