Citation: Iyer, P.N.; Smith, A.J. (1967). Double oxides containing niobium, tantalum, or protactinium. III. Systems involving the rare earths. Acta Crystallographica (1,1948-23,1967), 23, pp. 740-746.
Formula: La0.667 O4.25 Ta2
Chemical name: (La Ta3 O9)0.6667
List type: noninterleaving
List: 3D
Basis: (1;0;0 0;1;0 0;0;1)
Dimensionality: 3
Formula: La O20 Ta2 (La O20 Ta2)
Multiplicity: 1