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| American ceramic Society Bulletin, Vol. 92, No. 320 MAX phases : Bridging the gap between metals and ceramicsMAX phases : Bridging the gap between metals and ceramicsBy Miladin Radovic and Michel W. Barsoum cover storybulletin(Credit: Credit: Radovic and Benitez; TAMU.)T he term MAX phases was coined in the late 1990s and applies to a family of 60+ ternary carbides and nitrides that share a layered structure as illustrated in Figures 1 and 2. They are so called because of their chemical formula: Mn+1 AXn where n = 1, 2, or 3, where M is an early transition metal , A is an A-group element (specifi-cally, the subset of elements 13 16), and X is carbon and/or nitrogen, Figure Nowotny and coworkers2, 3 discovered most of these phases in powder form roughly 40 years ago. However, Barsoum and El-Raghy s4 report in 1996 on the synthesis of phase-pure bulk Ti3 SiC2 samples and their unusual combina-tion of properties catalyzed renewed interest in them.
20 www.ceramics.org | American Ceramic Society Bulletin, Vol. 92, No. 3 MAX phases: Bridging the gap between metals and ceramics MAX phases: Bridging the gap between metals
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