Open AccessInfluence of co‐dopant in the europium reduction in SrAl 2 O 4 host
Author(s) -
Rezende Marcos V. dos S.,
Montes Paulo J. R.,
Soares Felipe M. dos S.,
Santos Claudiane dos,
Valerio Mário E. G.
Publication year - 2014
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577513025708
Subject(s) - europium , dopant , xanes , doping , materials science , ion , inorganic chemistry , divalent , chemistry , analytical chemistry (journal) , luminescence , spectral line , metallurgy , physics , optoelectronics , organic chemistry , chromatography , astronomy
Xerogels of strontium chlorate and aluminium chlorate doped with europium (un‐co‐doped) and co‐doped with rare earth ions (Ln = Gd, Dy, Er and Y) were prepared using the proteic sol–gel route. Synchrotron radiation was used to investigate the effect of different co‐dopants on the Eu 3+ → Eu 2+ reduction process during the synthesis of the samples. Samples were excited at the Eu L III ‐edge and the XANES regions were analyzed. The results suggest that some of the Eu ions can be stabilized in the divalent state and that it is difficult to completely reduce Eu 3+ to Eu 2+ during thermal treatment. The mechanisms of the Eu reduction processes are explained by a proposed model based on the incorporation of charge‐compensation defects.