Li self-diffusion in garnet-type Li7La3Zr2O12 as probed directly by diffusion-induced 7Li spin-lattice relaxation NMR spectroscopy
Li self-diffusion in garnet-type Li7La3Zr2O12 as probed directly by diffusion-induced 7Li spin-lattice relaxation NMR spectroscopy
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DOI：
10.1103/physrevb.83.094302
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发表时间：
2011-03-15
影响因子：
3.7
通讯作者：
Wilkening, M.
中科院分区：
文献类型：
--
作者：
Kuhn, A.;Narayanan, S.;Wilkening, M.
采用变温Li-7自旋-自旋和自旋-晶格弛豫（SLR）核磁共振（NMR）谱研究了石榴石型Li 7 La 3 Zr 2 O（12）中Li的自扩散行为.在实验室和旋转参考系中记录的SLR NMR速率通过特征扩散诱导速率峰，允许直接测定Li跳跃速率τ（-1），其可以直接转化为自扩散系数D-sd。的NMR结果进行了比较，从电阻抗谱测量在一个大的温度和宽的频率范围内进行。总之，长程扩散过程主要负责环境温度下的离子传导，其特征在于活化能约为0.5 eV，其中tau（-1）（0）约为1 x 10（14）s（-1），是基础阿克里尼乌斯关系的指前因子。
Li self-diffusion in garnet-type Li7La3Zr2O12, crystallizing with tetragonal symmetry at room temperature, is measured by temperature-variable Li-7 spin-spin as well as spin-lattice relaxation (SLR) nuclear magnetic resonance (NMR) spectroscopy. The SLR NMR rates which were recorded in both the laboratory and the rotating frame of reference pass through characteristic diffusion-induced rate peaks allowing for the direct determination of Li jump rates tau(-1), which can be directly converted into self-diffusion coefficients D-sd. The NMR results are compared with those obtained from electrical impedance spectroscopy measurements carried out in a large temperature and wide frequency range. Taken together, the long-range diffusion process, being mainly responsible for ionic conduction at ambient temperature, is characterized by an activation energy of approximately 0.5 eV, with tau(-1)(0) approximate to 1 x 10(14) s(-1) being the pre-exponential factor of the underlying Arrhenius relation.