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

2nd Conference on Plasma & Laser Research and Technologies

Popov, V.V.^1,2 ; Menushenkov, A.P.^1 ; Yastrebtsev, A.A.^1 ; Zubavichus, Ya V.^2 ; Svetogorov, R.D.^2 ; Kolyshkin, N.A.^2

National Research Nuclear University MEPhI, Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow

115409, Russia^1

NRC, Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow

123182, Russia^2

关键词: Binary systems;    Fluorite structure;    Formation and evolutions;    Local structure;    Nucleation and growth;    Pyrochlore phase;    Synchrotron radiation x-ray diffractions;    X-ray amorphous;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/747/1/012042/pdf
DOI  :  10.1088/1742-6596/747/1/012042

来源: IOP

【 摘 要 】

The process of Dy2Zr2O7(rDy3+/rZr4+ = 1.426) nanocrystals formation and evolution upon calcinations up to 1400oC 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 800oC/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 > 1200oC. This is perhaps the first XRD study that reports the presence of a weak pyrochlore-type superstructure in the Dy2Zr2O7.