title: Monoclinic superstructure in orthorhombic Ce10W22O81 from transmission electron microscopy.
abstract: A complex rare-earth tungstate structure, present in a two-phased powder, was solved by electron diffraction, precession and high-resolution electron microscopy. The orthorhombic space group Pbnm and the atomic positions deduced from X-ray diffraction experiments were confirmed for Ce10W22O81. A C2/c monoclinic superstructure, with cell parameters a = 7.8, b = 36.1, c = 22.2 Å and β = 100.2°, was shown and attributed to a partial oxidation of Ce(3+) leading to interstitial oxygen ions.
authors.affiliation: Université du Toulon, CNRS, IM2NP, UMR 7334, BP 20132, F-83957 La Garde CEDEX, France.
authors.forename: Loïc
authors.initials: L
authors.lastname: Patout
authors.affiliation: Unité Matériaux et Transformations, Université Lille 1, CNRS UMR 8207, 59655 Villeneuve d'Ascq, France.
authors.forename: Damien
authors.initials: D
authors.lastname: Jacob
authors.affiliation: Université du Toulon, CNRS, IM2NP, UMR 7334, BP 20132, F-83957 La Garde CEDEX, France.
authors.forename: Madjid
authors.initials: M
authors.lastname: Arab
authors.affiliation: DEQ/PPGEQ-LMNRC, Universidade do Rio Grande de Norte, Natal, Brazil.
authors.forename: Carlson
authors.initials: C
authors.lastname: Pereira de Souza
authors.affiliation: Université du Toulon, CNRS, IM2NP, UMR 7334, BP 20132, F-83957 La Garde CEDEX, France.
authors.forename: Christine
authors.initials: C
authors.lastname: Leroux
keywords: high-resolution electron microscopy; image processing; precession electron diffraction; simulation; superstructure