Citation: Groult, D; Chailleux, J M; Raveau, B; Deschanvres, A (1977). Nouveaux tantalates A~3~ (Ta~8-x~ M~x~) O~21~ a structure en cages. Revue de Chimie Minerale, 14, pp. 1-10.
Formula: Fe0.5 K3 O21 Ta7.5
Chemical name:POTASSIUM TANTALUM IRON OXIDE (3/7.5/0.5/21)