Structural aspects of lithium insertion in oxides: LixReO3and Li2FeV3O8

We have determined the crystal structures of LiReO3, Li2ReO3and Li2FeV3O8, obtained by Li insertion of ReO3and FeV3O8, by neutron diffraction powder profile analysis. The ReO3host lattice is exclusively corner shared and undergoes significant twisting on Li insertion. The FeV3O8host lattice is extensively edge shared and changes little on Li insertion. The Li is accommodated in 6 coordinate sites in the rhenates and 5 coordinate sites in the iron vanadate.