Microstructural and optical features of a Eu-monazite |
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| Affiliation: | 1. Institute of Energy and Climate Research (IEK-6), Nuclear Waste Management and Reactor Safety, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany;2. Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany;3. Institute of Crystallography, RWTH Aachen University, 52066 Aachen, Germany;4. Institute of Energy and Climate Research (IEK-1), Materials Synthesis and Processing, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Nuclear Waste Management and Reactor Safety (IEK-6), 52425 Juelich, Germany;2. ICSM, UMR 5257 CEA/CNRS/ENSCM/Univ. Montpellier, Site de Marcoule, Bât. 426, BP 17171, 30207 Bagnols-sur-Cèze Cedex, France |
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| Abstract: | The obtention of europium-phosphate nanoparticles by the precipitation method and its thermal evolution to become ceramics materials is presented. The monazite structure was obtained from the rabdophane phase after firing at 1000 °C during several hours. The powder characteristics made easy the pressing and sintering processes and it was possible to obtain high density bodies (relative density > 97%) at only 1200 °C. The fluorescence spectra and the lifetimes were investigated as a function of the heating temperature, as well, the microstructure and the residual glassy phase. It was found that higher sintering temperatures (>1500 °C) resulted in lower fluorescence emission than lower temperatures (maximum at 1200 °C) as consequence of the microstructure detrimental. The gamma irradiation up to the dose of 18 kGys did not produce any appreciable effect in the optical properties; however, the sintering temperature modified the optical absorption in the UV range. |
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