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

Jackson

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.

Citation

Jackson. (2015). Study of Eu3+ -> Eu2+ reduction in BaAl2O4:Eu prepared in different gas atmospheres. Materials Research Bulletin, 348 -351. https://doi.org/10.1016/j.materresbull.2014.10.054

• Acceptance Date: Oct 20, 2014
• Publication Date: Jan 1, 2015
• 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