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An Exhaustive Symmetry Approach to Structure Determination: Phase Transitions in Bi2Sn2O7

“…Bi 2 Sn 2 O 7 has shown potential for technological applications in catalytic oxidation of isobutene, − methane coupling, phototcatalysis, and selective carbon monoxide sensing. ,− It was first reported by Roth in 1956 as having a diffraction pattern similar to that of cubic pyrochlores but with additional peaks pointing to a distorted structure. The first report of polymorphism in Bi 2 Sn 2 O 7 was given by Shannon and co-workers .…”

α-Bi2Sn2O7– a 176 atom crystal structure from powder diffraction data

“…20 Bi 2 Sn 2 O 7 also finds applications in gas-sensing devices, for example as a selective sensor for carbon monoxide in the presence of other gases. 8,[21][22][23] In an early structural study by Brisse and Knop 24 Bi 2 Sn 2 O 7 was described as pyrochlore-related, with the diffraction pattern containing extra reflections that precluded cubic indexing. The polymorphism of Bi 2 Sn 2 O 7 as a function of temperature was later studied by Shannon et al 25 According to this work, room temperature a-Bi 2 Sn 2 O 7 can be indexed using a bodycentered tetragonal cell with a ~15.05 A ˚and c ~21.5 A ˚.…”