Transmission electron microscopy evidence of a new tetragonal tungsten bronze superstructure
Abstract
Electron diffraction patterns of M56(O, F)156 (M = Mg, Nb, W) (along [001]) exhibit eight additional spots arranged on an octagon around every reflection of the tetragonal tungsten bronze-type (TTB) substructure. Four superstructure spots are located between the main reflections along all 〈210〉TTB directions. Two orientations of the new TTB superstructure (a = b = 2.73 nm, c [unk] 0.38 nm, α = β = γ = 90°) are present in the investigated crystal regions causing the unique octagonal array of spots. Highly resolved lattice images show that the arrangement of pentagonal tunnels filled with metal-oxygen strings is systematic in small domains. Four distinguishable variants of the superstructure appear. In each case two of them have the same orientation with respect to the TTB sublattice.
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