Monoclinic superstructure in orthorhombic Ce10W22O81 from transmission electron microscopy

Acta Crystallogr B Struct Sci Cryst Eng Mater. 2014 Apr;70(Pt 2):268-74. doi: 10.1107/S2052520613034252. Epub 2014 Mar 17.


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.

Keywords: high-resolution electron microscopy; image processing; precession electron diffraction; simulation; superstructure.