Structure and lithium ionic conduction mechanism in La4/3−yLi3yTi2O6 |
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Authors: | Y Zou N Inoue |
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Institution: | (1) Department of Physics, Faculty of Science, Ehime University, 2–5 Bunkyocho, Matsuyama, Ehime, Japan |
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Abstract: | The solid solutions La4/3−yLi3yTi2O6 (y=0.09∼0.33) have been studied by complex impedance spectroscopy, X-ray diffraction (XRD) and nuclear magnetic resonance
(NMR) methods. The ionic conductivity shows a maximum value at around y=0.21, and keeps high values at high y concentrations.
The XRD patterns show a single phase for all concentration. The crystal structure is orthorhombic with space groupPmmm for y=0.09∼0.15 and tetragonal with space groupP4/mmm for y=0.17∼0.33. The7Li static NMR spectra show a main central peak with a Lorenzian shape for y=0.09∼0.21. The central peak is divided into two
parts for y=0.23∼0.33. The narrow intense peak is a mobile component due to mobile ions, and a small broad central peak is
due to less mobile lithium ions which contribute to immobile component. The7Li MAS NMR spectra show negative chemical shifts which decrease with increasing y concentration. In this paper, we discuss
the conduction mechanism and the structure from the analysis of conductivity, lattice parameters, occupation, atomic positions
and the7Li static/MAS NMR spectra. |
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