期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 180, 期 1, 页码 322-330出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.10.013
关键词
XRD; amorphous phase quantification; incommensurate modulated structure; nuclear waste confinement
X-ray patterns of the Ba1Cs0.28Fe0.82Al1.46Ti5.72O16 compound evidence two wide peaks at low angle in addition to the well defined peaks of the I4/m hollandite structure type. Two hypotheses have been explored to account for these features: the coexistence of the hollandite phase with an amorphous phase and the appearance of a commensurate or incommensurate modulated structure associated with a cationic ordering, as proposed in the literature. Actually.. even if the amorphous phase quantification by the Rietveld method reveals about 15 wt% of non-crystalline phase in some of the powdered sample, the origin of the two wide peaks was found to stem from the incommensurate modulated character of the hollandite structure type (super space group I4/rn(00 gamma)00) with a distribution of the modulation wavevectors presumably related to slight chemical composition changes. (c) 2006 Elsevier Inc. All rights reserved.
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