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Synthesis and crystal structure of fluorite-type La2.4Zr1.2Ta0.4O7: A precursor oxide for low temperature formation of garnet-type Li6.5La3Zr1.5Ta0.5O12
Solid State Ionics ( IF 3.0 ) Pub Date : 2020-10-10 , DOI: 10.1016/j.ssi.2020.115460
Naoki Hamao , Koichi Hamamoto , Noboru Taguchi , Shingo Tanaka , Junji Akimoto

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, La2+xZr2-2xTaxO7 (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 Li6.5La3Zr1.5Ta0.5O12 at low-temperature. In addition, we prepared the sintering body of the Li6.5La3Zr1.5Ta0.5O12 using the precursor method. The fabricated sample exhibits a bulk Li-ion conductivity of 9.4 × 10−4 S cm−1 at 25 °C.



中文翻译:

萤石型La 2.4 Zr 1.2 Ta 0.4 O 7的合成及晶体结构:石榴石型Li 6.5 La 3 Zr 1.5 Ta 0.5 O 12的低温形成前驱体氧化物

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。

更新日期:2020-10-11
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