Thermally activated mobility of lithium ions in Li1?xCuSbO4 as studied by 7Li NMR

摘要

The Li di?usion in Li1?xCuSbO4 with lithium de?ciency x = 0.02,0.05,0.07 and 0.1 was studied by investigation of motional narrowing of the central 7Li NMR line in the temperature range from 290K to 470K. The activation energy of hopping of lithium ions was determined from the temperature dependence of the NMR linewidth. The dependence of the obtained activation energy on the lithium content indicates the opening of motion channels in the crystals at x close to 0.1 due to the formation of free vacancies at the lithium position, which favors the thermally activated hopping of ions.