Highly dense magnesium aluminate spinel bodies are usually fabricated using pressure-assisted methods, such as spark plasma sintering (SPS), in the presence of lithium fluoride as a sintering aid. The present work investigates whether the addition of transition metal fluorides promotes the sintering of MgAl2O4 bodies during SPS. At the same time, such fluorides can act as a source of optically active dopants. A commercial MgAl2O4 was mixed with 0.5 wt% of LiF, MnF2, and CoF2 and, afterwards, consolidated using SPS at 1400 °C. Although MnF2 and CoF2 promote the densification as effectively as LiF, they cause significant grain growth.

CEITEC BUT Brno University of Technology Purkynova 123 62100 Brno Czech Republic

Centre for Functional and Surface Functionalised Glass Alexander Dubcek University of Trencin 91150 Trencin Slovakia

Faculty of Mechanical Engineering Brno University of Technology Technicka 2 62100 Brno Czech Republic

Joint Glass Centre of the IIC SAS TnUAD and FChPT STU 91150 Trencin Slovakia

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