Fluorite-pyrochlore phase transition in nanostructured Ln2Hf2O7(Ln = La-Lu)

被引：0

作者：

机构：

[1] Popov, V.V.

[2] Menushenkov, A.P.

[3] 1,Yaroslavtsev, A.A.

[4] Zubavichus, Ya.V.

[5] Gaynanov, B.R.

[6] Yastrebtsev, A.A.

[7] Leshchev, D.S.

[8] Chernikov, R.V.

来源：

Menushenkov, A.P. (apmenushenkov@mephi.ru) | 1600年 / Elsevier Ltd卷 / 689期

基金：

俄罗斯科学基金会;

关键词：

X ray absorption spectroscopy - X ray diffraction - Fluorspar - Binary alloys - Distribution functions - Precipitation (chemical) - Crystal atomic structure - Lanthanum alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 Ln2Hf2O7compounds 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 rLn3+/rHf4+ratio) and the annealing temperature has been refined. © 2016 Elsevier B.V.

引用

共 50 条

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