Lithium manganese oxide crystals with composition (Li0.91Mn0.09)Mn2O4 were
synthesized by a flux method. The crystals have a structure closely related
to that of the cubic spinel LiMn2O4, but 9% of the lithium ions in the tet
rahedral 4a site are substituted by Mn2+ ions. This substitution lowers the
average Mn oxidation state below 3.5+, resulting in a Jahn-Teller distorti
on of the MnO6 octahedron.