Abstract
The structure of a crystal grown by crystallization from flux in the K2O-TiO2-Nb2O5-P2O5 system was studied by the methods X-ray diffraction analysis at room temperature. The crystals of the composition K2.47Nb2.85Ti1.15P2.5O17 are monoclinic, a = 13.7864(7) A, b = 6.4078(3) A, c = 16.9384(7) A, β = 83.15(1)°, sp. gr. P2/n. The structure was solved by the direct method using the SHELXS86 program package and refined by the JANA96 program. The crystal structure consists of a three-dimensional framework of sharing-vertices (Nb,Ti)O6-octahedra and the PO4-tetrahedra and two types of channels along the diagonal [101] direction, which are statistically occupied by potassium cations providing ionic transport in the compound.
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