| abstract |
A lithium lanthanum titanium oxide sintered body having a measurement temperature of 27 ° C. and a lithium ion conductivity of 3.0 × 10 −4 Scm −1 or more and a method for producing the same are provided. General formula (1-a) La x Li 2-3x obtained by sintering a mixed raw material powder in which the content of S in the mixed raw material powder of the titanium raw material, lithium raw material, and lanthanum raw material is 2000 ppm or less. TiO 3 -aSrTiO 3, the general formula (1-a) La x Li 2-3x TiO 3 -aLa 0.5 K 0.5 TiO 3, the general formula La x Li 2-3x Ti 1-a M a O 3- a , and the general formula Sr x-1.5a La a Li 1.5-2x Ti 0.5 Ta 0.5 O 3 (where 0.55 ≦ x ≦ 0.59, 0 ≦ a ≦ 0.2, M is a lithium lanthanum titanium oxide sintered body represented by any one general formula of at least one selected from Al, Fe, and Ga, and having a S concentration of 1500 ppm or less. |