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

Jackson

Study of Eu3+ -> Eu2+ reduction in BaAl2O4:Eu prepared in different gas atmospheres Thumbnail


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Abstract

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.

Acceptance Date Oct 20, 2014
Publication Date Jan 1, 2015
Publicly Available Date Mar 28, 2024
Journal Materials Research Bulletin
Print ISSN 0025-5408
Publisher Elsevier
Pages 348 -351
DOI https://doi.org/10.1016/j.materresbull.2014.10.054
Keywords Optical materials, XAFS (EXAFS and XANES), Optical properties
Publisher URL https://doi.org/10.1016/j.materresbull.2014.10.054

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