| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1488115 | Materials Research Bulletin | 2015 | 4 Pages |
•The effect of different gas atmospheres on the Eu reduction process was studied.•The Eu reduction was monitored analyzing XANES region at the Eu LIII-edge.•Hydrogen reducing agent are the most appropriate gas for Eu2+ stabilization.•Only a part of the Eu ions can be stabilized in the divalent state.•A model of Eu reduction process is proposed.
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.
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