Hesse, Sabine ; Seggern, Heinz von (2004)
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)
Artikel, Bibliographie
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 |
| Art des Eintrags: | Bibliographie |
| Titel: | Non-stoichiometric BaFBr:Eu2+ : a study on phase compositions and their relationship to F-centre formation |
| Sprache: | Englisch |
| Publikationsjahr: | 21 März 2004 |
| Verlag: | Institute of Physics Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics / D Applied Physics |
| Jahrgang/Volume einer Zeitschrift: | 37 |
| (Heft-)Nummer: | 6 |
| 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. |
| Zusätzliche Informationen: | Zeichendarst. im Sacht. teilw. nicht vorlagegemäß wiedergegeben |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Elektronische Materialeigenschaften |
| Hinterlegungsdatum: | 20 Nov 2008 08:19 |
| Letzte Änderung: | 20 Feb 2020 13:25 |
| PPN: | |
| Sponsoren: | The authors acknowledge the financial support of the Deutsche Forschungsgemeinschaft (DFG) for this work. |
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