title: Influence of co-dopant in the europium reduction in SrAl2O4 host.
abstract: 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 LIII-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.
authors.affiliation: Instituto Federal de Sergipe, Aracaju, SE 49055-260, Brazil.
authors.forename: Marcos V dos S
authors.initials: MV
authors.lastname: Rezende
authors.affiliation: Instituto Federal de Sergipe-IFS, Largato, SE 49400-000, Brazil.
authors.forename: Paulo J R
authors.initials: PJ
authors.lastname: Montes
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, Campus Universitário, São Cristovão, SE 49100-000, Brazil.
authors.forename: Felipe M dos S
authors.initials: FM
authors.lastname: Soares
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, Campus Universitário, São Cristovão, SE 49100-000, Brazil.
authors.forename: Claudiane
authors.initials: C
authors.lastname: dos Santos
authors.affiliation: Departamento de Física, Universidade Federal de Sergipe, Campus Universitário, São Cristovão, SE 49100-000, Brazil.
authors.forename: Mário E G
authors.initials: ME
authors.lastname: Valerio
keywords: DXAS measurements; defects; europium reduction