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Experimental and th...
Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3
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- Anasori, Babak (author)
- Drexel University, PA 19104 USA; Drexel University, PA 19104 USA
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- Dahlqvist, Martin (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Halim, Joseph (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten,Drexel University, PA 19104 USA
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- Ju Moon, Eun (author)
- Drexel University, PA 19104 USA
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- Lu, Jun (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Hosler, Brian C. (author)
- Drexel University, PA 19104 USA
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- Caspi, Elad N. (author)
- Drexel University, PA 19104 USA; Nucl Research Centre Negev, Israel
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- May, Steven J. (author)
- Drexel University, PA 19104 USA
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- Hultman, Lars (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Eklund, Per (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Rosén, Johanna (author)
- Linköpings universitet,Tunnfilmsfysik,Tekniska fakulteten
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- Barsoum, Michel W. (author)
- Drexel University, PA 19104 USA
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(creator_code:org_t)
- AMER INST PHYSICS, 2015
- 2015
- English.
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In: Journal of Applied Physics. - : AMER INST PHYSICS. - 0021-8979 .- 1089-7550. ; 118:9, s. 094304-
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Abstract
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- Herein, we report on the phase stabilities and crystal structures of two newly discovered ordered, quaternary MAX phases-Mo2TiAlC2 and Mo2Ti2AlC3-synthesized by mixing and heating different elemental powder mixtures of mMo:(3-m) Ti:1.1Al:2C with 1.5 less than= m less than= 2.2 and 2Mo: 2Ti:1.1Al:2.7C to 1600 degrees C for 4 h under Ar flow. In general, for m greater than= 2 an ordered 312 phase, (Mo2Ti) AlC2, was the majority phase; for mless than 2, an ordered 413 phase (Mo2Ti2)AlC3, was the major product. The actual chemistries determined from X-ray photoelectron spectroscopy (XPS) are Mo2TiAlC1.7 and Mo2Ti1.9Al0.9C2.5, respectively. High resolution scanning transmission microscopy, XPS and Rietveld analysis of powder X-ray diffraction confirmed the general ordered stacking sequence to be Mo-Ti-Mo-Al-Mo-Ti-Mo for Mo2TiAlC2 and Mo-Ti-Ti-Mo-Al-Mo-Ti-Ti-Mo for Mo2Ti2AlC3, with the carbon atoms occupying the octahedral sites between the transition metal layers. Consistent with the experimental results, the theoretical calculations clearly show that M layer ordering is mostly driven by the high penalty paid in energy by having the Mo atoms surrounded by C in a face-centered configuration, i.e., in the center of the Mn+1Xn blocks. At 331 GPa and 367 GPa, respectively, the Youngs moduli of the ordered Mo2TiAlC2 and Mo2Ti2AlC3 are predicted to be higher than those calculated for their ternary end members. Like most other MAX phases, because of the high density of states at the Fermi level, the resistivity measurement over 300 to 10K for both phases showed metallic behavior. (C) 2015 AIP Publishing LLC.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Anasori, Babak
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Dahlqvist, Marti ...
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Halim, Joseph
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Ju Moon, Eun
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Lu, Jun
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Hosler, Brian C.
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show more...
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Caspi, Elad N.
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May, Steven J.
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Hultman, Lars
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Eklund, Per
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Rosén, Johanna
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Barsoum, Michel ...
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Journal of Appli ...
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Linköping University