Titel
The Quantification of Radiation Damage in Orthophosphates Using Confocal μ-Luminescence Spectroscopy of Nd3+
Autor*in
Gordon Thorogood
Australian Nuclear Science and Technology Organisation
Robert Aughterson
Australian Nuclear Science and Technology Organisation
... show all
Abstract
In this study, we present a new concept based on the steady-state, laser-induced photoluminescence of Nd3+, which aims at a direct determination of the amorphous fraction f a in monazite- and xenotime-type orthophosphates on a micrometer scale. Polycrystalline, cold-pressed, sintered LaPO4, and YPO4 ceramics were exposed to quadruple Au-ion irradiation with ion energies 35 MeV (50% of the respective total fluence), 22 MeV (21%), 14 MeV (16%), and 7 MeV (13%). Total irradiation fluences were varied in the range 1.6 × 1013–6.5 × 1013 ions/cm2. Ion-irradiation resulted in amorphization and damage accumulation unto a depth of ~5 μm below the irradiated surfaces. The amorphous fraction created was quantified by means of surface-sensitive grazing-incidence X-ray diffraction and photoluminescence spectroscopy using state-of-the-art confocal spectrometers with spatial resolution in the μm range. Monazite-type LaPO4 was found to be more susceptible to ion-irradiation induced damage accumulation than xenotime-type YPO4. Transmission electron microscopy of lamella cut from irradiated surfaces with the focused-ion beam technique confirmed damage depth-profiles with those obtained from PL hyperspectral mapping. Potential analytical advantages that arise from an improved characterization and quantification of radiation damage (i.e., f a) on the μm-scale are discussed.
Stichwort
xenotime YPO4monazite LaPO4nuclear waste formsrare-earth elements REEluminescence spectroscopygrazing-incidence X-ray diffractionamorphous fractionstructural disorder
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1144830
Erschienen in
Titel
Frontiers in Chemistry
Band
7
ISSN
2296-2646
Erscheinungsdatum
2019
Publication
Frontiers Media SA
Erscheinungsdatum
2019
Zugänglichkeit
Rechte
Rechteangabe
© 2019 Lenz, Thorogood, Aughterson, Ionescu, Gregg, Davis and Lumpkin
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