Abstract
Single crystals of the composition K2.92Nb2.58Ti1.42P2.5O17 possessing ionic conductivity σ = 103 Ω cm−1 at 300°C were grown by the method of spontaneous crystallization from flux in the quaternary K2O-TiO2-Nb2O5-P2O5 system. The X-ray diffraction study of the single crystals grown showed that they are monoclinic with the unit-cell parameters a = 13.800(1), b = 6.412(2), c = 16.893(3) A, β = 83.33(1)°, Z = 16, sp. gr. P2/n and provided the determination of the structure of this new compound. The Nb and Ti atoms statistically (with different probabilities) occupy four crystallographically independent octahedra. The (Nb,Ti) and P-tetrahedra form the three-dimensional framework with the channels along the diagonal [101] direction occupied by potassium atoms.
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