A mixed indium-iron lithium diphosphate, In0.51Fe 0.49LiP2O7

Abstract

The structure of In0.51Fe0.49LiP2O 7 consists of a three-dimensional network constructed from (In III/FeIII)O6 octa-hedra and P2O7 groups. Each M IIIO6 octa-hedron is linked to six PO4 tetra-hedra belonging to five differet P2O7 groups and shares two corners with the same P2O7 group so as to build infinite chains or rather parallel colums of [M IIIP2O11] running along the a axis. The linkage between these chains or columns defines hepta-gonal tunnels parallel to [100] in which the Li+ ions are located in off-centred positions. The In0.51Fe0.49LiP 2O7 compound can be regarded as one composition of the continuous solid solution between LiFeP2O7 and LiInP2O7 whose structure is isotypic with the A IFeP2O7 (A I = Na, K, Rb, Cs and Ag) diphosphate family.