Study of Eu3+ → Eu2+ reduction in BaAl2O4:Eu prepared in different gas atmospheres

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[1] Dos S. Rezende, Marcos V.
[2] Valerio, Mário E.G.
[3] Jackson, Robert A.
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Dos S. Rezende, Marcos V. | 1600年 / Elsevier Ltd卷 / 61期
关键词：
Carbon monoxide - Europium compounds - Barium compounds - Synchrotron radiation - Aluminum compounds - Optical properties;
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摘要：
The effect of different gas atmospheres such as H2(g), synthetic air, carbon monoxide (CO) and nitrogen (N2) on the Eu3+ → Eu2+ reduction process during the synthesis of Eu-doped BaAl2O4 was studied using synchrotron radiation. The Eu3+ → Eu2+ reduction was monitored analyzing XANES region when the sample are excited at the Eu LIII-edge. The results show that the hydrogen reducing agent are the most appropriate gas for Eu2+ stabilization in BaAl2O4 and that only a part of the Eu ions can be stabilized in the divalent state. A model of Eu reduction process, based on the incorporation of charge compensation defects, is proposed. © 2014 Elsevier Ltd. All rights reserved.
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