Cation exchange rates and mobility in aluminum-doped lithium orthosilicate : high-resolution lithium-6 NMR results
Abstract Magic-angle spinning NMR spectra on 6 Li in Li 4 SiO 4 , Li 4.1 Al 0.1 Si 0.9 O 4 , and Li 3.7 Al 0.1 SiO 4 resolve multiple lithium cation sites, and, with increasing temperature, show averaging due to exchange of Li + among sites. These exchange rates predict measured ionic conductivity accurately. Doping with aluminum increases Li mobility significantly.