Synthesis and single crystal X‐ray structure of the tetragonal tungsten bronze Pb 0.91 K 1.72 Li 1.46 Nb 5 O 15

Crystals of Pb 0.91 K 1.72 Li 1.46 Nb 5 O 15 , 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) Å 3 . The three‐dimensional framework can be described as a layered structure down crystallographic axis c , with arrays of NbO 6 octahedra, whose corner sharing makes up the formation of tunnels filled up by Li, Pb and K displaying complex cation‐oxygen coordinations. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)