Abstract
Transparent sintered ceramics of spinel oxides compounds have attracted a lot of attention due to their expected structural stability in extreme environments. In this work, the evolution of structural defects was observed in fine-grain transparent MgAl\(_{2}\)O\(_{4}\) ceramics following consolidation of spinel powders via Spark Plasma Sintering and heat treatment under air. A dark discoloration due to a carbon contamination and partial reduction during the sintering process was suppressed via post-annealing under air. The correlated EPR and cathodoluminescence analyses showed significance of the Mn\(^{4+}\) ions reduction after consolidation of powders.
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Acknowledgements
This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No 101052200—EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. The authors are grateful to the SPS Platform Ile-de-France (France) and would like to thank B. Villeroy (ICMPE-CNRS, France) for his technical expertise.
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Spiridigliozzi, H., Mercone, S., Lang, G. et al. Structural defects effect in fine-grained MgAl\(_{{2}}\)O\(_{{4}}\) sintered ceramics: optical and RPE properties as function of microstructure. Eur. Phys. J. Spec. Top. 231, 4167–4171 (2022). https://doi.org/10.1140/epjs/s11734-022-00574-x
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DOI: https://doi.org/10.1140/epjs/s11734-022-00574-x