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The quasi-binary phase diagram BaF2-BaBr2 and its relation to the x-ray storage phosphor BaFBr : Eu2+

Kolb, Robert and Schlapp, Michael and Hesse, Sabine and Schmechel, Roland and Seggern, Heinz von and Fasel, Claudia and Riedel, Ralf and Ehrenberg, Helmut and Fuess, Hartmut (2002):
The quasi-binary phase diagram BaF2-BaBr2 and its relation to the x-ray storage phosphor BaFBr : Eu2+.
35, In: Journal of physics / D, (16), IOP Science, pp. 1914-1918, ISSN 0022-3727, [Article]

Abstract

In order to understand the formation and stoichiometry of the x-ray storage phosphor BaFBr: Eu2+, the phase diagram of the quasi-binary BaF2-BaBr2 system has been investigated. The phase diagram was obtained by means of differential thermal analysis and temperature controlled x-ray diffraction experiments. The resulting phase diagram indicates that BaFBr forms a compound with no detectable solid solubility for neither BaF2 nor BaBr2. Experiments to obtain non-stoichiometric BaFBr via the synthesis route using BaF2 and NH4Br as proposed in the literature could not be verified. It will be shown that the type of colour centre created during x-ray irradiation is related to the non-stoichiometry of the starting compositions before sintering. A surplus of either barium fluoride or barium bromide during sintering allows the controlled formation of F(Br-)- and F(F-)-centres, respectively.

Item Type: Article
Erschienen: 2002
Creators: Kolb, Robert and Schlapp, Michael and Hesse, Sabine and Schmechel, Roland and Seggern, Heinz von and Fasel, Claudia and Riedel, Ralf and Ehrenberg, Helmut and Fuess, Hartmut
Title: The quasi-binary phase diagram BaF2-BaBr2 and its relation to the x-ray storage phosphor BaFBr : Eu2+
Language: English
Abstract:

In order to understand the formation and stoichiometry of the x-ray storage phosphor BaFBr: Eu2+, the phase diagram of the quasi-binary BaF2-BaBr2 system has been investigated. The phase diagram was obtained by means of differential thermal analysis and temperature controlled x-ray diffraction experiments. The resulting phase diagram indicates that BaFBr forms a compound with no detectable solid solubility for neither BaF2 nor BaBr2. Experiments to obtain non-stoichiometric BaFBr via the synthesis route using BaF2 and NH4Br as proposed in the literature could not be verified. It will be shown that the type of colour centre created during x-ray irradiation is related to the non-stoichiometry of the starting compositions before sintering. A surplus of either barium fluoride or barium bromide during sintering allows the controlled formation of F(Br-)- and F(F-)-centres, respectively.

Journal or Publication Title: Journal of physics / D
Volume: 35
Number: 16
Publisher: IOP Science
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Structure Research
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 19 Nov 2008 16:29
License: [undefiniert]
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