Influence of synthesis conditions on the crystal structure of the powder formed in the ZrO2 - Ce2O3/CeO2 system

被引：3
|
作者：
Popov, V. V. [1 ,2 ]
Menushenkov, A. P. [1 ]
Khubbutdinov, R. M. [1 ]
Svetogorov, R. D. [2 ]
Zubavichus, Ya V. [2 ]
Sharapov, A. S. [1 ]
Kurilkin, V. V. [3 ]
机构：
[1] Natl Res Nucl Univ, MEPhI Moscow Engn Phys Inst, Kashirskoe Sh 31, Moscow 115409, Russia
[2] NRC Kurchatov Inst, Pl Akad Kurchatova 1, Moscow 123182, Russia
[3] Peoples Friendship Univ Russia, Moscow, Russia
来源：
II CONFERENCE ON PLASMA & LASER RESEARCH AND TECHNOLOGIES | 2016年 / 747卷
关键词：
FEATURES; DY; LN;
D O I：
10.1088/1742-6596/747/1/012041
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Influence of synthesis conditions (type of atmosphere, reduction and oxidation, annealing temperature) on the chemical composition and structure of the compounds formed in the "ZrO2 - Ce2O3 / CeO2" system has been investigated by X-ray absorption fine structure (XAFS) spectroscopy combined with X-ray diffraction (XRD) and thermogravimetric analysis (TGA). It is revealed that isothermal annealing of precursor at temperatures less than 1000 degrees C in air leads to formation of Ce0.5Zr0.5O2 powders with cubic fluorite-type structure (Fm-3m). Further increase of annealing temperatures above 1000 degrees C causes decomposition of formed crystal structure into two phases: cubic and tetragonal. Annealing in reduction hydrogen atmosphere causes formation of Ce2x4+Ce2-2x3+Zr2O7+x compounds with intermediate valency of cerium, where value of x depends on the reducing conditions and treatment parameters of precursor. Annealing in vacuum at 1400. strongly reduces the content of Ce4+ in a powder samples and leads to formation of pyrochlore structure (space group Fd-3m) with practically Ce3+ valence state.
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页数：5
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