Structural defects effect in fine-grained MgAlO sintered ceramics: optical and RPE properties as function of microstructure

Hugo Spiridigliozzi; Silvana Mercone; Guillaume Lang; Eduard Feldbach; Andrei Kanaev; Frédéric Schœnstein

doi:10.1140/epjs/s11734-022-00574-x

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2023 Impact factor 2.6

Special Topics

Engineered Materials: Micro-Nano-Structure, Properties and Applications

Eur. Phys. J. Spec. Top. (2022) 231: 4167-4171
https://doi.org/10.1140/epjs/s11734-022-00574-x

Regular Article

Structural defects effect in fine-grained MgAl $_{2}$ $_{{2}}$ O $_{4}$ $_{{4}}$ sintered ceramics: optical and RPE properties as function of microstructure

Hugo Spiridigliozzi¹^a, Silvana Mercone², Guillaume Lang³, Eduard Feldbach⁴, Andrei Kanaev¹ and Frédéric Schœnstein¹

¹ LSPM UPR 3407, CNRS, Université Sorbonne Paris Nord, 93430, Villetaneuse, France
² GREMAN UMR7347, CNRS, Université de Tours, 37200, Tours, France
³ LPEM, ESPCI Paris, Université PSL, Sorbonne Université, CNRS, 75005, Paris, France
⁴ Institute of Physics, University of Tartu, 50411, Tartu, Estonia

^a hugo.spiridigliozzi@lspm.cnrs.fr

Received: 4 February 2022
Accepted: 9 April 2022
Published online: 17 April 2022

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 $_{2}$ $_{2}$ O $_{4}$ $_{4}$ 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 $^{4 +}$ $^{4+}$ ions reduction after consolidation of powders.