Synthesis and properties of Al-free Li7-xLa3Zr2-xTaxO12 garnet related oxides

被引:80
作者
Inada, Ryoji [1 ]
Kusakabe, Koji [1 ]
Tanaka, Takayuki [1 ]
Kudo, Shota [1 ]
Sakurai, Yoji [1 ]
机构
[1] Toyohashi Univ Technol, Dept Elect & Elect Informat Engn, Toyohashi, Aichi 4418580, Japan
关键词
Li7La3Zr2O12; garnet; Cubic structure; Al-free; Ta substitution; Ionic conductivity; CONDUCTIVITY; LI7LA3ZR2O12;
D O I
10.1016/j.ssi.2013.09.008
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We investigated the properties of Al-free garnet related Li7La3Zr2O12 (LLZ) and Li7 - xLa3Zr2 - xTaxO12 (LLZTa) with Ta contents x = 025, 0.5 and 1.0 synthesized by a solid state reaction method. It was confirmed that all Al-free LLZTa have the cubic garnet related structure, while Al-free LLZ without Ta substitution has a tetragonal one. No other secondary phases were observed in all sintered samples. This indicates that partial substitution of Zr4+ by Ta5+ with higher valence increases Li-ion vacancy concentration in a garnet framework and stabilizes cubic garnet structure. The LLZTa grains are in good contact with each other although a certain amount of pores in the boundary area can be observed. Total (bulk + grain boundary) Li-ion conductivity at 27 degrees C for all Al-free LLZTa was well above 10(-4) Scm(-1), while Al-free LLZ showed a much lower room temperature conductivity of 1 x 10(-5) Scm(-1). The highest room temperature conductivity of 6.1 x 10(-4) Scm(-1) was obtained in Al-free LLZTa with x = 0.5, which is approximately 30-40% lower than the value in LLZTa (x = 0.5) with Al inclusion as previously reported. (C) 2013 Elsevier B.V. All rights reserved.
引用
收藏
页码:568 / 572
页数:5
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