scholarly journals Features of a nano-twist phase in the nanolayered Ti3AlC2 MAX phase

2022 ◽  
Vol 210 ◽  
pp. 114425
Julien Guénolé ◽  
Vincent Taupin ◽  
Maxime Vallet ◽  
Wenbo Yu ◽  
Antoine Guitton
Metals ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 265 ◽  
Muhammad Naveed ◽  
Aleksei Obrosov ◽  
Andrzej Zak ◽  
Wlodzimierz Dudzinski ◽  
Alex Volinsky ◽  

2021 ◽  
Vol 528 ◽  
pp. 167803
Sergey Lyaschenko ◽  
Olga Maximova ◽  
Dmitriy Shevtsov ◽  
Sergey Varnakov ◽  
Ivan Tarasov ◽  

2021 ◽  
Vol 10 (3) ◽  
pp. 578-586
Lin-Kun Shi ◽  
Xiaobing Zhou ◽  
Jian-Qing Dai ◽  
Ke Chen ◽  
Zhengren Huang ◽  

AbstractA nano-laminated Y3Si2C2 ceramic material was successfully synthesized via an in situ reaction between YH2 and SiC using spark plasma sintering technology. A MAX phase-like ternary layered structure of Y3Si2C2 was observed at the atomic-scale by high resolution transmission electron microscopy. The lattice parameters calculated from both X-ray diffraction and selected area electron diffraction patterns are in good agreement with the reported theoretical results. The nano-laminated fracture of kink boundaries, delamination, and slipping were observed at the tip of the Vickers indents. The elastic modulus and Vickers hardness of Y3Si2C2 ceramics (with 5.5 wt% Y2O3) sintered at 1500 °C were 156 and 6.4 GPa, respectively. The corresponding values of thermal and electrical conductivity were 13.7 W·m-1·K-1 and 6.3×105 S·m-1, respectively.

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3222
Kamil Goc ◽  
Janusz Przewoźnik ◽  
Katarzyna Witulska ◽  
Leszek Chlubny ◽  
Waldemar Tokarz ◽  

A study of Ti3Al1−xSixC2 (x = 0 to x = 1) MAX-phase alloys is reported. The materials were obtained from mixtures of Ti3AlC2 and Ti3SiC2 powders with hot pressing sintering technique. They were characterised with X-ray diffraction, heat capacity, electrical resistivity, and magnetoresistance measurements. The results show a good quality crystal structure and metallic properties with high residual resistivity. The resistivity weakly varies with Si doping and shows a small, positive magnetoresistance effect. The magnetoresistance exhibits a quadratic dependence on the magnetic field, which indicates a dominant contribution from open electronic orbits. The Debye temperatures and Sommerfeld coefficient values derived from specific heat data show slight variations with Si content, with decreasing tendency for the former and an increase for the latter. Experimental results were supported by band structure calculations whose results are consistent with the experiment concerning specific heat, resistivity, and magnetoresistance measurements. In particular, they reveal that of the s-electrons at the Fermi level, those of Al and Si have prevailing density of states and, thus predominantly contribute to the metallic conductivity. This also shows that the high residual resistivity of the materials studied is an intrinsic effect, not due to defects of the crystal structure.

2016 ◽  
Vol 99 (4) ◽  
pp. 1137-1140 ◽  
Dylan T. Cuskelly ◽  
Erich H. Kisi

ACS Nano ◽  
2021 ◽  
Vol 15 (2) ◽  
pp. 2771-2777
Ali Jawaid ◽  
Asra Hassan ◽  
Gregory Neher ◽  
Dhriti Nepal ◽  
Ruth Pachter ◽  

Kirill Sobolev ◽  
Mikhail Gorshenkov ◽  
Pietro Manfrinetti ◽  
Davide Peddis ◽  
Anna Pazniak ◽  

2021 ◽  
Matthew Quesne ◽  
C. Richard A. Catlow ◽  
Nora Henriette De Leeuw

We present several in silico insights into the MAX-phase of early transition metal silicon carbides and explore how these affect carbon dioxide hydrogenation. Periodic desity functional methodology is applied to...

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