Provided are: a sintered lithium lanthanum titanium oxide which has a lithium ion conductivity of 3.0 × 10-4 Scm-1 or more at a measurement temperature of 27°C; and a method for producing the sintered lithium lanthanum titanium oxide. A sintered lithium lanthanum titanium oxide which is obtained by sintering a mixed starting material powder that contains S in an amount of 2,000 ppm or less relative to the total amount of the mixed starting material powder containing a titanium starting material, a lithium starting material and a lanthanum starting material, which is represented by one of general formula (1-a)LaxLi2-3xTiO3-aSrTiO3, general formula (1-a)LaxLi2-3xTiO3-aLa0.5K0.5TiO3, general formula LaxLi2-3xTi1-aMaO3-a, and general formula Srx-1.5aLaaLi1.5-2xTi0.5Ta0.5O3 (wherein 0.55 ≤ x ≤ 0.59, 0 ≤ a ≤ 0.2, and M represents at least one element selected from among Al, Fe and Ga), and which has an S concentration of 1,500 ppm or less.
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机译：提供：在27℃的测量温度下具有3.0×10 -4 Scm -1 或更高的锂离子电导率的烧结锂镧钛氧化物;以及以及制备锂镧钛氧化物烧结体的方法。烧结的锂镧钛氧化物，其通过烧结相对于含有钛原材料，锂原材料和锂的混合原材料粉末的总量为2,000ppm以下的S的混合原材料粉末而得到。以通式（1-a）La x Li 2-3x TiO 3 -aSrTiO 3 ，通式（1-a）La x Li 2-3x TiO 3 -aLa 0.5 < / Sub> K 0.5 TiO 3 ，通式La x Li 2-3x Ti 1- a M a O 3-a ，通式为Sr x-1.5a La a Li 1.5-2x Ti 0.5 Ta 0.5 O 3 （其中0.55≤x≤0.59，0≤a≤ M为0.2，并且M表示选自Al，Fe和Ga中的至少一种元素，并且其S浓度为1500ppm以下。
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