Synthesis and single crystal X-ray structure of the tetragonal tungsten bronze Pb0.91K1.72Li1.46Nb5O15

Crystals of Pb0.91K1.72Li1.46Nb5O15, belonging to tetragonal tungsten bronze materials, were grown by the slow cooling technique, and characterized by means of single crystal X-ray diffraction: the structure was solved in the P4bm tetragonal space group, with the following unit cell parameters: a = 12.548(5), c = 4.042(5) Å, V = 636.4(9) Å3. The three-dimensional framework can be described as a layered structure down crystallographic axis c, with arrays of NbO6 octahedra, whose corner sharing makes up the formation of tunnels filled up by Li, Pb and K displaying complex cation-oxygen coordinations.