The combined study of Dy2O3-HfO2 nanocrystallites formation by means of EXAFS, PDF, XRD and SAXS

The process of double oxide Dy2O3-HfO2 nanocrystallites formation upon annealing to 1600°C was investigated with the combination off few X-ray and synchrotron methods. XRD and PDF show the mean crystal structure to be fluorite typical for the compounds of Ln2O3-MeO2 type. The ordering of structure a...

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Main Authors: Yaroslavtsev, A A, Menushenkov, A P, Leshchev, D S, Bednarcik, J, Chernikov, R V, Zubavichus, Y V, Popov, V V, Petrunin, V F, Korovin, S A
Format: Conference Proceeding
Language:English
Subjects:
Annealing
Crystal structure
Fluorite
Gadolinium oxides
Hafnium oxide
Nanocrystals
Physics
Pyrochlores
Short range order
Small angle X ray scattering
Superstructures
Synchrotrons
X-ray diffraction
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Summary:The process of double oxide Dy2O3-HfO2 nanocrystallites formation upon annealing to 1600°C was investigated with the combination off few X-ray and synchrotron methods. XRD and PDF show the mean crystal structure to be fluorite typical for the compounds of Ln2O3-MeO2 type. The ordering of structure and the growth of nanocrystallites upon annealing was estimated independently from XRD patterns, PDF functions and SAXS scattering curves. Neither transition to pyrochlore phase, nor signs of recently shown in related Gd2O3-HfO2 compounds pyrochlore-type superstructure is observed. However, EXAFS and the short range order of PDF clearly indicate the discrepancy between Dy and Hf local environment. Such a disorder of local crystal structure cannot be described by the fluorite model.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/430/1/012132