Citation: Oyetola, S; Verbaere, A; Guyomard, D; Crosnier, M P; Piffard, Y; Tournoux, M (1991). New ZrP~2~O~7~-like diphosphates of either mixed (M^III^~1/2~M'^V^~1/2~) cations (M=Sb,Bi,Nd,Eu;M'=Sb, Nb,Ta) or M'^V^ cations (M'=Ta,Nb):synthesis and structure. European Journal of Solid State Inorganic Chemistry, 28, pp. 23-36.
Formula: O7 P1.901 Ta0.899
Chemical name:Tantalum phosphorus oxide (0.9/1.9/7)