Abstract: The formation of nanocrystal powders of Pr2M2O7 (M=Zr, Hf) compounds upon calcinations up to 1400°C has been investigated by using of X-ray absorption fine structure (XAFS) spectroscopy combined with X-ray powder diffraction (XRD). The structure ordering upon calcination was estimated independently from XRD and EXAFS data. It was found that the phase transition fluorite-pyrochlore occurs at calcination temperature in the range of 900–1000°C. The appearance of the ordered pyrochlore structure at calcination temperatures above 1000°C was manifested as splitting of the first oxygen coordination shell of the local praseodymium environment and supported by a sharp reduction of the Debye-Waller factor values of interatomic bonds. Besides we observed the L3-Hf X-ray absorption near edge line shape splitting with increasing of annealing temperature of amorphous precursor due to crystal field influence in high ordered pyrochlore-type structure.

Cite: Menushenkov A.P. , Popov V.V. , Gaynanov B.R. , Zubavichus Y.V.
Pr2M2O7 (M=Zr, Hf) Local and Crystal Structure Changes in a Fluorite-Pyrochlore Phase Transition
Journal of Physics: Conference Series. 2016. V.747. 012038 :1-5. DOI: 10.1088/1742-6596/747/1/012038 WOS Scopus РИНЦ AN OpenAlex

Files: Full text from publisher

Dates:

Submitted:	Sep 1, 2016
Published print:	Sep 1, 2016
Published online:	Sep 21, 2016

Identifiers:

Web of science:	WOS:000387066400038
Scopus:	2-s2.0-84992154232
Elibrary:	27581546
Chemical Abstracts:	2016:1945889
OpenAlex:	W2522931050

Citing:

DB	Citing
Web of science	3
Scopus	3
OpenAlex	1

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