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Comment on "High-pressure spark plasma sintering (SPS) of transparent polycrystalline magnesium aluminate spinel (PMAS)" by M. Sokol, S. Kalabukhov, M. P. Dariel, N. Frage [J. Eur. Ceram. Soc. 34 (2014) 4305]

: Krell, Andreas


Journal of the European Ceramic Society 35 (2015), No.8, pp.2433-2435
ISSN: 0955-2219
Journal Article
Fraunhofer IKTS ()
spinel; hardness; Hall-Petch; transparency

The validity of the Hall–Petch relationship for transparent spinel ceramics with grain sizes of 0.2–0.1 μm is confirmed here in context with data for coarser microstructures >0.3 μm and up to 200 μm whereas there is no further hardness increase on the transition to nanoscale spinel microstructures. Although such cubic ceramics do not suffer birefringent scattering, all active optical losses are subject to a strong influence of the thickness. Most technical applications of transparent spinel request components thicker than 1–2 mm and need, therefore, very high in-line transmission data when measured on thinner samples.