High local disorder in Tb2Hf2O7 pyrochlore oxide nanocrystals

16th International Conference on X-ray Absorption Fine Structure

Kabanova, V.A.^1 ; Popov, V.V.^1 ; Zubavichus, Ya.V.^2 ; Kulik, E.S.^2 ; Yaroslavtsev, A.A.^1,3,4 ; Chernikov, R.V.^5 ; Menushenkov, A.P.^1

National Research Nuclear University MEPhl, Kashirskoe sh. 31, Moscow

115409, Russia^1

NRC Kurchatov Institute, Akademika Kurhatova sq. 1, Moscow

123182, Russia^2

European XFEL GmbH, Albert-Einstein-Ring 19, Hamburg

22761, Germany^3

I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, Hamburg

20355, Germany^4

DESY Photon Science, Notkestrasse 85, Hamburg

22607, Germany^5

关键词: Local disorder;    Local structure;    Pair distribution function analysis;    Pyrochlore oxide;    Structure ordering;    XRD patterns;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012113/pdf
DOI  :  10.1088/1742-6596/712/1/012113

来源: IOP

【 摘 要 】

The process of Tb2Hf2O7nanocrystals formation upon annealing to 1600°C was investigated by means of X-ray absorption fine structure (XAFS) spectroscopy combined with X-ray diffraction (XRD) and pair distribution function (PDF) analysis. The structure ordering and the growth of nanocrystals upon annealing were estimated independently from XRD patterns and PDF. The probable content of Tb4+ions in Tb2Hf2O7was estimated from XANES. All studies indicate a high disorder and a large number of local structure defects in Tb2Hf2O7pyrochlore oxide.