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]. Issue 8 (August 2015)

• Record Type: Journal Article
• Authors: Krell, Andreas
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 8(2015:Aug.)
• Page Start: 2433
• Page End: 2435
• Publication Date: 2015-08
• Subjects: Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.01.028
• Languages: English
• ISSNs: 0955-2219

Abstract

<abstract abstract-type="author" id="abs0005"> <title id="sect0005">Abstract</title> <sec> <p id="spar0005">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 &gt;0.3 μm and up to 200 μm whereas there is no further hardness increase on the transition to <italic>nanoscale</italic> 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.</p> </sec> </abstract>