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MAX phases The MAX Phases are layered, hexagonal carbides and nitrides have the general formula: Mn+1AXn, (MAX) where n = 1 to 3, M is an early transition metal, A is an A-group (mostly IIIA and IVA, or groups 13 and 14) element and X is either carbon and/or nitrogen. == History ==
In the 1990s, the ternary compound, Ti3SiC2, was synthesized and fully characterized for the first time by Dr. Michel Barsoum's research group at Drexel University. A year later they showed that this compound was but one of over sixty phases,〔Barsoum, M.W., Brodkin, D., & El-Raghy, T., Layered Machinable Ceramics For High Temperature Applications. Scrip. Met. et. Mater. 36, 535-541 (1997)〕 most discovered and produced in powder form in the 1960s by H. Nowotny and coworkers.〔Nowotny, H., Struktuchemie Einiger Verbindungen der Ubergangsmetalle mit den elementen C, Si, Ge, Sn. Prog. Solid State Chem. 2, 27 (1970)〕 In 1999 they discovered Ti4AlN3 and realized that they were dealing with a much larger family of solids that all behaved similarly. Since 1996, when the first paper was published on the subject, tremendous progress has been made in understanding the properties of these phases and the 1996 article 〔Barsoum, M.W. & El-Raghy, T., Synthesis and Characterization of a Remarkable Ceramic: Ti3SiC2. J. Amer. Cer. Soc. 79 (7), 1953-1956 (1996)〕 has been cited over 650 times.〔Barsoum, M.W. & El-Raghy, T., Synthesis and Characterization of a Remarkable Ceramic: Ti3SiC2. J. Amer. Cer. Soc. 79 (7), 1953-1956 (1996)〕
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