Work

Structural properties of fluorozirconate-based glass ceramics doped with multivalent europium

Year: 2011

Type: article

Abstract: The structure/property relationships of fluorochlorozirconate glass ceramics as a function of divalent and trivalent europium (Eu) co-doping and thermal processing have been investigated; the influence of doping ratio on the formation of barium chloride (BaCl(2)) nanocrystals therein was elucidated. X-ray absorption near-edge structure spectroscopy shows that the post-thermal annealing changes the Eu valence of the as-poured glass slightly, but during the melting process Eu(3+) is more strongly reduced to Eu(2+), in particular, when doped as a chloride instead of fluoride compound. The Eu(2+)-to-Eu(3+) doping ratio also plays a significant role in chemical equilibrium in the melt. X-ray diffraction measurements indicate that a higher Eu(2+) fraction leads to a BaCl(2) phase transition from hexagonal to orthorhombic structure at a lower temperature.

Source: Journal of Applied Physics

DOI: 10.1063/1.3662148

Authors: C. Paßlick, O. Müller, D. Lützenkirchen-Hecht, R. Frahm, J. A. Johnson, S. Schweizer