Abstract
Ion exchange reactions have been tested in sodium-containing NASICON materials in order to prepare Li1 + xAlxTi2 − x(PO4)3 compounds with high lithium content, x ≥ 0.6. However, the studied lithium exchange reactions are not complete and the final solids have an appreciable sodium content. Structural characterisation by the Rietveld method reveals that sodium partially remains at the M1 site and the M2 site is fully exchanged by Li+