Monoclinic superstructure in the orthorhombic Ce10W22O81 from transmission electron microscopy

L. Patout 1 D. Jacob 2 Madjid Arab 1 Carlson Pereira de Souza 3 Christine Leroux 1
1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 UMET - Unité Matériaux et Transformations - UMR 8207
3 LMNRC
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-rays diffraction experiments were confirmed for Ce10W22O81. A C2/c monoclinic superstructure, with cell parameters a = 7.8 Å, b = 36.1 Å, c = 22.2 Å and β = 100.2°, was evidenced and attributed to a partial oxidation of Ce3+ leading to interstitial oxygen ions.
Keywords : Precession electron diffraction high-resolution electron microscopy superstructure image processing simulation
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Submitted on : Friday, August 1, 2014 - 10:36:25 AM
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L. Patout, D. Jacob, Madjid Arab, Carlson Pereira de Souza, Christine Leroux. Monoclinic superstructure in the orthorhombic Ce10W22O81 from transmission electron microscopy. Acta crystallographica Section B: Structural crystallography and crystal chemistry, International Union of Crystallography, 2014, 70, pp.268. ⟨10.1107/S20525203613034252⟩. ⟨hal-01053691⟩

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