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- Publisher
- Springer Journals
- Copyright
- Copyright © 2005 by IfI - Institute for Ionics
- Subject
- Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
- ISSN
- 0947-7047
- eISSN
- 1862-0760
- DOI
- 10.1007/BF02430243
- Publisher site
- See Article on Publisher Site
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.
Journal
Ionics – Springer Journals
Published: May 16, 2006