Fluorite-Pyrochlore Phase Transition in Nanostructured Ln2Hf2O7 (Ln = La-Lu) Full article
Journal |
Journal of Alloys and Compounds
ISSN: 0925-8388 , E-ISSN: 1873-4669 |
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Output data | Year: 2016, Volume: 689, Pages: 669-679 Pages count : 11 DOI: 10.1016/j.jallcom.2016.08.019 | ||||||||
Tags | Lanthanide hafnates; Oxide materials; Precipitation; Pyrochlore; Fluorite; Phase transitions | ||||||||
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Abstract:
Complex oxides of the Ln2Hf2O7 (Ln = lanthanide) series undergo a fluorite to pyrochlore phase transformation. We have studied the whole process of the crystal and local atomic structure realignment during the crystallization and the phase transition in the series of Ln2Hf2O7 (Ln = La-Lu) samples synthesized by the coprecipitation method with the subsequent annealing of mixed hydroxides (precursors). The study employed a combination of x-ray diffraction (normal and anomalous), x-ray absorption spectroscopy, analysis of atomic pair distribution function and Raman spectroscopy. The starting and ending temperatures of the fluorite-pyrochlore phase transition for Ln2Hf2O7 compounds have been determined along the lanthanide series La-Dy. The scheme summarizing structure types (amorphous, fluorite and pyrochlore) for the whole Ln2Hf2O7 (Ln = La-Lu) series as a function of the Ln cation radius (or the rLn3þ=rHf4þ ratio) and the annealing temperature has been refined.
Cite:
Popov V.V.
, Menushenkov A.P.
, Yaroslavtsev A.A.
, Zubavichus Y.V.
, Gaynanov B.R.
, Yastrebtsev A.A.
, Leshchev D.S.
, Chernikov R.V.
Fluorite-Pyrochlore Phase Transition in Nanostructured Ln2Hf2O7 (Ln = La-Lu)
Journal of Alloys and Compounds. 2016. V.689. P.669-679. DOI: 10.1016/j.jallcom.2016.08.019 WOS Scopus РИНЦ
Fluorite-Pyrochlore Phase Transition in Nanostructured Ln2Hf2O7 (Ln = La-Lu)
Journal of Alloys and Compounds. 2016. V.689. P.669-679. DOI: 10.1016/j.jallcom.2016.08.019 WOS Scopus РИНЦ
Dates:
Submitted: | May 23, 2016 |
Accepted: | Aug 3, 2016 |
Published online: | Aug 4, 2016 |
Published print: | Dec 25, 2016 |
Identifiers:
Web of science | WOS:000384427200089 |
Scopus | 2-s2.0-84981342020 |
Elibrary | 27135245 |
Chemical Abstracts | 2016:1355455 |
Chemical Abstracts (print) | 165:349581 |
OpenAlex | W2484892666 |