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- W2045304086 abstract "Herein we report on the thermal expansions and temperature-dependent crystal structures of select ternary carbide MAX phases in the Ti-Al-C phase diagram in the 100-1000 deg C temperature range. A bulk sample containing 38 wt.% Ti5Al2C3, 523), $32 wt.% Ti2AlC (211), 18 wt.% Ti3AlC2 (312), and 12 wt.% (Ti{0.5}Al{0.5})Al is studied by Rietveld analysis of high-temperature neutron diffraction data. We also report on the same for a single-phase sample of Ti$_3$AlC$_2$ for comparison. The thermal expansions of all the MAX phases studied are higher in the $c$ direction than in the $a$ direction. The bulk expansion coefficients - 9.3 x 10^-6 for Ti5Al2C3, 9.2 x 10^-6 for Ti2AlC, and 9.0 x 10^-6 for Ti3AlC2 - are comparable within one standard deviation of each other. In Ti5Al2C3, the dimensions of the Ti-C octahedra for the 211-like and 312-like regions are comparable to the Ti-C octahedra in Ti2AlC and Ti3AlC2, respectively. The isotropic mean-squared atomic displacement parameters are highest for the Al atoms in all three phases, and the values predicted from first-principles phonon calculations agree well with those measured." @default.
- W2045304086 created "2016-06-24" @default.
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- W2045304086 date "2013-05-10" @default.
- W2045304086 modified "2023-09-26" @default.
- W2045304086 title "High-temperature neutron diffraction and first-principles study of temperature-dependent crystal structures and atomic vibrations in Ti3AlC2, Ti2AlC, and Ti5Al2C3" @default.
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