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Origin of the superstructure elucidated by atomic resolution HAADF‐STEM and HREM in the Ce 10 W 22 O 81 lanthanide tungstate phase
Author(s) -
Patout Loïc,
Hallaoui Abdelali,
Neisius Thomas,
Campos Andrea P. C.,
Dominici Christian,
Alfonso Claude,
Charaï Ahmed
Publication year - 2018
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576718001103
Subject(s) - superstructure , orthorhombic crystal system , crystallography , scanning transmission electron microscopy , tungstate , materials science , ternary operation , transmission electron microscopy , phase (matter) , electron diffraction , lanthanide , dark field microscopy , crystal structure , chemistry , diffraction , nanotechnology , inorganic chemistry , microscopy , optics , ion , physics , organic chemistry , computer science , programming language , oceanography , geology
The present paper provides new information on the attribution of the cationic sites of the orthorhombic Ce 10 W 22 O 81 crystal phase prepared in the CeO 2 –Ce 2 O 3 –WO 3 ternary system. Atomic resolution HAADF‐STEM (high‐angle annular dark‐field scanning transmission electron microscopy) and HREM (high‐resolution electron microscopy) investigations have highlighted the presence of two mixed columns of Ce and W cations along the a axis that were previously assigned to pure W cations in the asymmetric unit. This discovery explains the presence of a commensurate superstructure doubling the orthorhombic unit‐cell length a o .