New oxide-ion conductors Ln(2+x)Ti(2-x)O(7-x/2) (Ln = Dy-Lu, x = 0.096; 35.5 mol. % Ln(2)O(3) 64,5 mol.% TiO2)-LANTIOX with a disordered pyrochlore structure are obtained by coprecipitation with next thermal annealing at 1600 degrees C. Their ionic conductivity in air at 740 degrees C attains 5(.)10(-3) S/cm for Ln(2.096)Ti(1.904)O(6.952) (Ln= Lu, Yb), 10(-3) S/cm for Ln(2,096)Ti(1,904)O(6,952) (Ln=Tm, Er, Ho) and 10(-4)S/cm for Dy2,096Ti1,904O6,952 due to the presence of defects in both the cation and anion sublattices. The materials contain similar to 4.8-10.6% Ln(Ti) anti-site defects. Ln(2.096)Ti(1.904)O(6.952) ceramics are shown to be stable in the temperature range of 1400 to 1700 degrees C. 1400 degrees C-samples Ln(2+x)Ti(2-x)O(7-x/2) have lower ionic conductivity then 1600 degrees C and 1690 degrees C samples.