TU Darmstadt / ULB / TUbiblio

Non-stoichiometric BaFBr:Eu2+ : a study on phase compositions and their relationship to F-centre formation

Hesse, Sabine ; Seggern, Heinz von :
Non-stoichiometric BaFBr:Eu2+ : a study on phase compositions and their relationship to F-centre formation.
In: Journal of Physics / D Applied Physics, 37 (6) pp. 836-841.
[Artikel], (2004)

Kurzbeschreibung (Abstract)

Even though image plate technology is successfully applied in x-ray detection, many questions concerning its detailed functional mechanisms have still not been answered. In this paper it will be shown that a previously suggested non-stoichiometric monophase of BaF1.12Br0.88 : Eu2+ resulting from the BaF2/NH4Br preparation route cannot be supported. It will be demonstrated by x-ray analysis that depending on the starting ratio of BaF2 to NH4Br during sintering or the already synthesized BaFBr : Eu2+ to BaF2 during annealing, stoichiometric BaFBr : Eu2+ with or without a BaF2 phase will always be obtained. Furthermore, it will be shown that in the case of a molar stoichiometric starting ratio of BaF2/NH4Br, partial sublimation of NH4Br during sintering can be hold responsible for the appearance of BaF2 as a second phase. Rietveld refinement is utilized to derive the quantitative amount of the individual phase compositions of BaFBr : Eu2+ and BaF2. In terms of image plate properties, it will be shown that the composition of BaFBr : Eu2+ and BaF2 after the high temperature treatment determines the type of photostimulable colour centre generated during x-irradiation. Finally, the results obtained will be interpreted in terms of published photostimulated luminescence formation models.

Typ des Eintrags: Artikel
Erschienen: 2004
Autor(en): Hesse, Sabine ; Seggern, Heinz von
Titel: Non-stoichiometric BaFBr:Eu2+ : a study on phase compositions and their relationship to F-centre formation
Sprache: Englisch
Kurzbeschreibung (Abstract):

Even though image plate technology is successfully applied in x-ray detection, many questions concerning its detailed functional mechanisms have still not been answered. In this paper it will be shown that a previously suggested non-stoichiometric monophase of BaF1.12Br0.88 : Eu2+ resulting from the BaF2/NH4Br preparation route cannot be supported. It will be demonstrated by x-ray analysis that depending on the starting ratio of BaF2 to NH4Br during sintering or the already synthesized BaFBr : Eu2+ to BaF2 during annealing, stoichiometric BaFBr : Eu2+ with or without a BaF2 phase will always be obtained. Furthermore, it will be shown that in the case of a molar stoichiometric starting ratio of BaF2/NH4Br, partial sublimation of NH4Br during sintering can be hold responsible for the appearance of BaF2 as a second phase. Rietveld refinement is utilized to derive the quantitative amount of the individual phase compositions of BaFBr : Eu2+ and BaF2. In terms of image plate properties, it will be shown that the composition of BaFBr : Eu2+ and BaF2 after the high temperature treatment determines the type of photostimulable colour centre generated during x-irradiation. Finally, the results obtained will be interpreted in terms of published photostimulated luminescence formation models.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Physics / D Applied Physics
Band: 37
(Heft-)Nummer: 6
Verlag: Institute of Physics Publishing
Fachbereich(e)/-gebiet(e): Fachbereich Material- und Geowissenschaften > Materialwissenschaften > Elektronische Materialeigenschaften
Fachbereich Material- und Geowissenschaften > Materialwissenschaften
Fachbereich Material- und Geowissenschaften
Hinterlegungsdatum: 20 Nov 2008 08:19
Zusätzliche Informationen:

Zeichendarst. im Sacht. teilw. nicht vorlagegemäß wiedergegeben

Sponsoren: The authors acknowledge the financial support of the Deutsche Forschungsgemeinschaft (DFG) for this work.
Export:

Optionen (nur für Redakteure)

Eintrag anzeigen Eintrag anzeigen