Citation: Ijjaali, M.; Venturini, G.; Gerardin, R.; Malaman, B.; Gleitzer, C. (1991). Synthesis, structure and physical properties of a mixed-valence iron diphosphate Fe3(P2O7)2 ; first example of trigonal prismatic Fe2+ with O2- ligands. European Journal of Solid State and Inorganic Chemistry, 28, pp. 983-998.