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

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

Domains: Physics [physics]; Condensed Matter [cond-mat]; Materials Science [cond-mat.mtrl-sci]

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, 2014, 70, pp.268. ⟨10.1107/S2052520613034252⟩. ⟨hal-01053691⟩