Single crystals of the title compound, aluminium niobium triphosphate, Al0.5Nb1.5(PO4)3, have been synthesized by a high-temperature reaction in a platinium crucible. The AlIII and NbV atoms occupy the same site on the axis, with disorder in the ratio of 1:3. The fundamental building units of the title structure are isolated Al/NbO6 octahedra and PO4 tetrahedra (. 2 symmetry), which are further interlocked by corner-sharing O atoms, leading to a three-dimensional framework structure with infinite channels along the a axis
