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XANES studies on Eu-doped fluorozirconate-based glass ceramics

 
: Henke, B.; Keil, P.; Paßlick, C.; Vogel, D.; Rohwerder, M.; Wiegand, M.; Johnson, J.A.; Schweizer, S.

:

Wang, C. (Hrsg.) ; Materials Research Society -MRS-:
In-situ and operando probing of energy materials at multiscale down to single atomic column: The power of X-rays, neutrons and electron microscopy : Symposium held April 5 - 9, 2010, San Francisco, California; Papers presented at Symposium V, "In Situ Transmission Electron Microscopy and Spectroscopy", and Symposium W, "Diagnostics and Characterization of Energy Materials with Synchrotron Neutron Radiation" held at the 2010 MRS spring meeting
Warrendale, Pa.: MRS, 2010 (Materials Research Society Symposium Proceedings 1262)
ISBN: 978-1-605-11239-8
ISSN: 0272-9172
pp.137-144
Materials Research Society (Spring Meeting) <2010, San Francisco/Calif.>
Symposium V "In Situ Transmission Electron Microscopy and Spectroscopy" <2010, San Francisco/Calif.>
Symposium W "Diagnostics and Characterization of Energy Materials with Synchrotron Neutron Radiation" <2010, San Francisco/Calif.>
English
Conference Paper
Fraunhofer IWM ()
Fraunhofer CSP ()

Abstract
The influence of adding InF3 as a reducing agent on the oxidation state of Eu in fluoro-chloro- (FCZ) and fluorobromozirconate (FBZ) glass ceramics was investigated using x-ray absorption near edge (XANES) and photoluminescence (PL) spectroscopy. For both materials, it was found that InF3 decreases the Eu2+-to-Eu3+ ratio significantly. PL spectroscopy proved that an annealing step leads to the formation of Eu-doped BaCl2 and BaBr2 nanocrystals in the FCZ and FBZ glasses, respectively. In the case of FCZ glass ceramics the hexagonal phase of BaCl2 could be detected in indium-free and InF3-doped ceramics, but only for InF3 containing FCZ glass ceramics a phase transition of the nanoparticles from hexagonal to orthorhombic structure is observed. For the FBZ glass ceramics, the hexagonal phase of BaBr2 can be formed with and without indium doping, but only in the indium-free case a phase transition to orthorhombic BaBr2 could be found.

: http://publica.fraunhofer.de/documents/N-183577.html