Abstract
A new niobium monophosphate KNb 3P 3O 15 has been isolated. Its structure was solved from a single-crystal X-ray study in the space group Pnnm with the cell parameters: a = 13.3085(9), b = 14.7382(10), c = 6.4615(2)Å, and Z = 4. The refinement by full-matrix least-squares calculations led to R = 0.029 with 3184 independent reflections. The structure is built up from corner-sharing NbO 6 octahedra and PO 4 tetrahedra which delimit five-sided tunnels containing the K ions and empty square and triangular tunnels. These tunnels are like those observed in the tetragonal tungsten bronzes.
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