scholarly journals Frank partial dislocation in Ti2AlC-MAX phase induced by matrix-Cu diffusion

2021 ◽  
Vol 191 ◽  
pp. 34-39
Author(s):  
Wenbo Yu ◽  
Julien Guénolé ◽  
Jaafar Ghanbaja ◽  
Maxime Vallet ◽  
Antoine Guitton
Keyword(s):  
Partial Dislocation ◽  
Max Phase

The relaxation of compressive biaxial strains in SOS via microtwins

1989 ◽  
Vol 47 ◽  
pp. 608-609
Author(s):  
M. E. Twigg ◽  
E. D. Richmond ◽  
J. G. Pellegrino
Keyword(s):  
Thin Film ◽  
Chemical Vapor Deposition ◽  
Molecular Beam Epitaxy ◽  
Compressive Stress ◽  
Vapor Deposition ◽  
Partial Dislocation ◽  
Molecular Beam ◽  
Volume Fraction ◽  
Chemical Vapor ◽  
Silicon Thin Film

For heteroepitaxial systems, such as silicon on sapphire (SOS), microtwins occur in significant numbers and are thought to contribute to strain relief in the silicon thin film. The size of this contribution can be assessed from TEM measurements, of the differential volume fraction of microtwins, dV/dν (the derivative of the microtwin volume V with respect to the film volume ν), for SOS grown by both chemical vapor deposition (CVD) and molecular beam epitaxy (MBE).In a (001) silicon thin film subjected to compressive stress along the [100] axis , this stress can be relieved by four twinning systems: a/6[211]/( lll), a/6(21l]/(l1l), a/6[21l] /( l1l), and a/6(2ll)/(1ll).3 For the a/6[211]/(1ll) system, the glide of a single a/6[2ll] twinning partial dislocation draws the two halves of the crystal, separated by the microtwin, closer together by a/3.

scholarly journals Sputtering Power Effects on Growth and Mechanical Properties of Cr2AlC MAX Phase Coatings

Metals ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 265 ◽  
Author(s):  
Muhammad Naveed ◽  
Aleksei Obrosov ◽  
Andrzej Zak ◽  
Wlodzimierz Dudzinski ◽  
Alex Volinsky ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Max Phase ◽  
Sputtering Power

Optical and magneto-optical properties of epitaxial Mn2GaC MAX phase thin film

2021 ◽  
Vol 528 ◽  
pp. 167803
Author(s):  
Sergey Lyaschenko ◽  
Olga Maximova ◽  
Dmitriy Shevtsov ◽  
Sergey Varnakov ◽  
Ivan Tarasov ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Properties ◽  
Max Phase

scholarly journals Microstructure and properties of nano-laminated Y3Si2C2 ceramics fabricated via in situ reaction by spark plasma sintering

2021 ◽  
Vol 10 (3) ◽  
pp. 578-586
Author(s):  
Lin-Kun Shi ◽  
Xiaobing Zhou ◽  
Jian-Qing Dai ◽  
Ke Chen ◽  
Zhengren Huang ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Atomic Scale ◽  
Max Phase ◽  
X Ray Diffraction ◽  
Selected Area Electron Diffraction ◽  
Plasma Sintering ◽  
Transmission Electron ◽  
Spark Plasma ◽  
Diffraction Patterns

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.

scholarly journals Structure, Morphology, Heat Capacity, and Electrical Transport Properties of Ti3(Al,Si)C2 Materials

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3222
Author(s):  
Kamil Goc ◽  
Janusz Przewoźnik ◽  
Katarzyna Witulska ◽  
Leszek Chlubny ◽  
Waldemar Tokarz ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Heat Capacity ◽  
Specific Heat ◽  
Electrical Transport ◽  
Residual Resistivity ◽  
Max Phase ◽  
Electrical Transport Properties ◽  
Debye Temperatures ◽  
Si Content ◽  
Hot Pressing Sintering

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.

Single-Step Carbothermal Synthesis of High-Purity MAX Phase Powders

2016 ◽  
Vol 99 (4) ◽  
pp. 1137-1140 ◽  
Author(s):  
Dylan T. Cuskelly ◽  
Erich H. Kisi
Keyword(s):  
High Purity ◽  
Single Step ◽  
Max Phase ◽  
Carbothermal Synthesis

Halogen Etch of Ti3AlC2 MAX Phase for MXene Fabrication

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

Synthesis of phase-pure highly-doped MAX-phase (Cr1-xMnx)2AlC

2021 ◽  
Author(s):  
Kirill Sobolev ◽  
Mikhail Gorshenkov ◽  
Pietro Manfrinetti ◽  
Davide Peddis ◽  
Anna Pazniak ◽  
...  
Keyword(s):  
Max Phase ◽  
Phase Pure

scholarly journals How bulk and surface properties of Ti4SiC3, V4SiC3, Nb4SiC3 and Zr4SiC3 tune reactivity: A computational study

2021 ◽  
Author(s):  
Matthew Quesne ◽  
C. Richard A. Catlow ◽  
Nora Henriette De Leeuw
Keyword(s):  
Carbon Dioxide ◽  
Transition Metal ◽  
Surface Properties ◽  
In Silico ◽  
Computational Study ◽  
Max Phase ◽  
Early Transition Metal ◽  
Silicon Carbides ◽  
Carbon Dioxide Hydrogenation ◽  
Early Transition

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...

Sign in / Sign up

Export Citation Format

Share Document