Abstract
K2.6Nb11.6O30, Mr = 1659.33 g ⋅ mol−1, crystallizes in the tetragonal system, space group P4/mbm, Z = 1. The lattice parameters are a = 12.549(3) Å, c = 3.978(2) Å, V = 626.4(4) Å3, D x _{x} = 4.398 g ⋅ cm−3. The crystal structure was solved and refined from 413 independent reflections, obtained by X-ray diffraction on a single crystal. The final R index and weighted R w index are 0.0500 and 0.1178, respectively. The three-dimensional network of K2.6Nb11.6O30 is similar to that of tetragonal tungsten bronze with K and Nb partially occupying the interstitial pentagonal and trigonal sites. The most interest of this structure is the planar pentagonal coordination of Nb atoms.
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Ftini, M.M., Ayed, B. & Haddad, A. K2.6Nb11.6O30: a novel tetragonal bronze structure. Journal of Chemical Crystallography 33, 123–129 (2003). https://doi.org/10.1023/A:1023222825088
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DOI: https://doi.org/10.1023/A:1023222825088