In this study, we synthesized the solid solution system between La₂Zr₂O₇ and La₃TaO₇ with a fluorite-type structure for the first time by the polymerized complex method and refined its crystal structural parameter using the Rietveld method. Furthermore, we synthesized a garnet-type Li-ion conductor by the precursor method which used a solid solution, La_2+xZr_2-2xTa_xO₇ (x = 0.4), as a precursor material. To investigate the reactivity between the Li oxides and the fluorite-type precursor oxide, we performed TG-DTA measurements. As a result, an exothermic peak was observed at 420 °C, indicating the phase formation of the garnet-type Li_6.5La₃Zr_1.5Ta_0.5O₁₂ at low-temperature. In addition, we prepared the sintering body of the Li_6.5La₃Zr_1.5Ta_0.5O₁₂ using the precursor method. The fabricated sample exhibits a bulk Li-ion conductivity of 9.4 × 10⁻⁴ S cm⁻¹ at 25 °C.

在这项研究中，我们通过聚合络合物方法首次合成了具有萤石型结构的La ₂ Zr ₂ O ₇和La ₃ TaO ₇之间的固溶体体系，并使用Rietveld方法精炼了其晶体结构参数。此外，我们通过使用固溶体La _{2+ x} Zr _{2-2 x} Ta _x O ₇的前驱体方法合成了石榴石型锂离子导体。（x = 0.4），作为前体材料。为了研究Li氧化物和萤石型前驱体氧化物之间的反应性，我们进行了TG-DTA测量。结果，在420℃观察到放热峰，表明石榴石型Li _6.5 La ₃ Zr _1.5 Ta _0.5 O ₁₂在低温下的相形成。另外，我们使用前体方法制备了Li _6.5 La ₃ Zr _1.5 Ta _0.5 O ₁₂的烧结体。制成的样品在25°C时具有9.4×10 ^-4  S cm ^-1的整体锂离子电导率。