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Structure of a new bulk Ti5Al2C3 MAX phase produced by the topotactic transformation of Ti2AlC
Drexel University, USA .
Drexel University,USA .
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2837-3656
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2012 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 32, no 12, 3485-3491 p.Article in journal (Refereed) Published
Abstract [en]

Upon annealing cold-pressed Ti2AlC,-325 mesh powders, at 1500 degrees C for 8 h in argon, the resulting partially sintered sample contained 43(+/- 2) wt.% of the layered ternary carbide Ti5Al2C3. Herein, the X-ray powder diffraction pattern of Ti5Al2C3 is reported for the first time and its structure and stoichiometry are confirmed through high-resolution transmission electron microscopy. This phase has a trigonal structure (space group P3m1) with a unit cell consisting of 3 formula units and cell parameters of a=3.064 angstrom, c = 48.23 angstrom. The lattice parameters determined through first principles calculations agree reasonably well with the experimentally determined values. At 147.1 GPa, the calculated bulk modulus falls between the bulk moduli of Ti2AlC and Ti3AlC2. The transformation from Ti2AlC to Ti5Al2C3 is topotactic.

Place, publisher, year, edition, pages
Elsevier , 2012. Vol. 32, no 12, 3485-3491 p.
Keyword [en]
Carbides; Sintering; Electron microscopy; X-ray methods; Powders-solid state reaction
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-79646DOI: 10.1016/j.jeurceramsoc.2012.03.035ISI: 000306298300053OAI: oai:DiVA.org:liu-79646DiVA: diva2:544317
Available from: 2012-08-14 Created: 2012-08-13 Last updated: 2017-12-07

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Lu, JunHultman, Lars

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