Features of crystal and local structures of complex oxides formed in the binary system Dy2O3-ZrO2

The process of Dy2Zr2O7 (rDy3+ rZr4+ = 1.426) nanocrystals formation and evolution upon calcinations up to 1400 oC has been investigated by means of synchrotron radiation X-ray diffraction (XRD) and Raman spectroscopy. We observed that isothermal calcination of the X-ray amorphous precursor first le...

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Bibliographic Details
Published in:Journal of physics. Conference series 2016-09, Vol.747 (1)
Main Authors: Popov, V V, Menushenkov, A P, Yastrebtsev, A A, Zubavichus, Ya V, Svetogorov, R D, Kolyshkin, N A
Format: Article
Language:English
Subjects:
Crystal structure
Crystals
Fluorite
Nanocrystals
Nucleation
Physics
Pyrochlores
Raman spectroscopy
Superstructures
Synchrotron radiation
Synchrotrons
X-ray diffraction
Zirconium dioxide
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Summary:The process of Dy2Zr2O7 (rDy3+ rZr4+ = 1.426) nanocrystals formation and evolution upon calcinations up to 1400 oC has been investigated by means of synchrotron radiation X-ray diffraction (XRD) and Raman spectroscopy. We observed that isothermal calcination of the X-ray amorphous precursor first leads to the formation of oxide nanocrystalline powders with a defect fluorite structure at 800 oC 3 h. The nucleation and growth of pyrochlore phase take place in nanodomains with pyrochlore-type superstructural ordering of cations and anions inside a well crystalline fluorite matrix at > 1200 oC. This is perhaps the first XRD study that reports the presence of a weak pyrochlore-type superstructure in the Dy2Zr2O7.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/747/1/012042