Des conducteurs ioniques pseudo-bidimensionnels: Li8MO6 (M = Zr, Sn), Li7LO6 (L = Nb, Ta) et Li6In2O6

The ionic conductivity of the pseudo-2D oxides Li8MO6 (M = Zr, Sn), Li7LO6 (L = Nb, Ta) and Li6In2O6 has been measured and related to their structures. The ideal lattice consists of octahedral sheets [(Li2M)O6]n, [(Li□L)O6]n or [(In2□)O6]n of CdI2-type, between which 6 Li+ ions are inserted with a tetrahedral environment. As expected from the structures the highest lithium mobility is observed for Li7LO6 phases and the smallest one for Li8MO6.