Size-dependent pressure-induced amorphization: a thermodynamic panorama

2015 ◽  
Vol 17 (2) ◽  
pp. 903-910 ◽  
Author(s):  
Denis Machon ◽  
Patrice Mélinon
Keyword(s):  
High Pressure ◽  
Defect Density ◽  
Surface States ◽  
Complex Behavior ◽  
Size Dependent ◽  
Main Factors

The complex behavior of nanoparticles subjected to high-pressure is analyzed using different thermodynamic and geometrical approaches. The defect density and the surface states are identified as the main factors governing the pressure-induced transitions of nanoparticles.

Single-walled carbon nanotubes as high pressure nanocontainer

2014 ◽  
Vol 28 (14) ◽  
pp. 1450074 ◽  
Author(s):  
Na Chen ◽  
Qing Xu ◽  
Xiang Ye
Keyword(s):  
Carbon Nanotubes ◽  
High Pressure ◽  
Internal Pressure ◽  
Single Walled Carbon Nanotubes ◽  
Elastic Model ◽  
Single Walled Carbon ◽  
Size Dependent ◽  
Bond Stretching ◽  
Walled Carbon Nanotubes ◽  
High Internal Pressure

The single-walled carbon nanotubes (SWCNTs) under high internal pressure are studied by the constant-pressure molecular dynamics method. The results show that SWCNTs are suitable candidates for high pressure nanocontainer, and they can resist 30 GPa to 110 GPa internal pressure. We find that the ultimate internal pressure that nanotubes can sustain is mainly determined by the radius of the tube, and it is not sensitive to the tube chirality. The breaking of the nanotube induced by high internal pressure is mainly due to bond stretching rather than bond angle changing. An elastic model is used to explain the size-dependent ultimate internal pressure behavior for SWCNTs.

scholarly journals Size-Dependent Surface States of Strained Cobalt Nanoislands on Cu(111)

2007 ◽  
Vol 99 (24) ◽  
Author(s):  
M. V. Rastei ◽  
B. Heinrich ◽  
L. Limot ◽  
P. A. Ignatiev ◽  
V. S. Stepanyuk ◽  
...  
Keyword(s):  
Surface States ◽  
Size Dependent

scholarly journals Causes of Distortion during High Pressure Gas Quenching Process of Steel Parts

2019 ◽  
Author(s):  
Justin Sims ◽  
Zhichao Li ◽  
B. Lynn Ferguson
Keyword(s):  
High Pressure ◽  
Cooling Rate ◽  
Dimensional Change ◽  
Bearing Steel ◽  
Complex Behavior ◽  
Load Bearing ◽  
Quenching Process ◽  
Nonlinear Relation ◽  
Gas Quenching ◽  
Quench Hardening

Abstract Quench hardening is a necessary process for improving the mechanical and fatigue performance of load bearing steel components, but liquid quenching can lead to large distortions. High pressure gas quenching is becoming a more popular choice, with the assumption that a slower cooling rate will lead to less distortion. While true for certain geometries, nonlinearities in distortion response can make understanding the dimensional change of a component difficult due to the inherently complex behavior during quenching. Through the use of modeling, and a specially designed coupon, the out-of-round distortion of an eccentric bore is examined for common high-pressure gas quenching conditions. The causes of distortion are examined and explained using the model, with insights into why the cooling rate has a nonlinear relation with distortion.

scholarly journals Pressure-induced superconductivity and structure phase transition in Pt2HgSe3

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Cuiying Pei ◽  
Suhua Jin ◽  
Peihao Huang ◽  
Anna Vymazalova ◽  
Lingling Gao ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Structural Phase ◽  
Applied Pressure ◽  
Surface States ◽  
Quantum Spin ◽  
Spintronic Devices ◽  
Structure Phase Transition ◽  
Pressure Regime ◽  
Nontrivial Topology

AbstractRecently monolayer jacutingaite (Pt2HgSe3), a naturally occurring exfoliable mineral, discovered in Brazil in 2008, has been theoretically predicted as a candidate quantum spin Hall system with a 0.5 eV band gap, while the bulk form is one of only a few known dual-topological insulators that may host different surface states protected by symmetries. In this work, we systematically investigate both structure and electronic evolution of bulk Pt2HgSe3 under high pressure up to 96 GPa. The nontrivial topology is theoretically stable, and persists up to the structural phase transition observed in the high-pressure regime. Interestingly, we found that this phase transition is accompanied by the appearance of superconductivity at around 55 GPa and the critical transition temperature Tc increases with applied pressure. Our results demonstrate that Pt2HgSe3 with nontrivial topology of electronic states displays a ground state upon compression and raises potentials in application to the next-generation spintronic devices.

Mechanical Properties of Silicon Carbide Nanowires: Effect of Size-Dependent Defect Density

Nano Letters ◽  
2014 ◽  
Vol 14 (2) ◽  
pp. 754-758 ◽  
Author(s):  
Guangming Cheng ◽  
Tzu-Hsuan Chang ◽  
Qingquan Qin ◽  
Hanchen Huang ◽  
Yong Zhu
Keyword(s):  
Mechanical Properties ◽  
Silicon Carbide ◽  
Defect Density ◽  
Size Dependent

Size-Dependent Amorphization of NanoscaleY2O3at High Pressure

2010 ◽  
Vol 105 (9) ◽  
Author(s):  
Lin Wang ◽  
Wenge Yang ◽  
Yang Ding ◽  
Yang Ren ◽  
Siguo Xiao ◽  
...  
Keyword(s):  
High Pressure ◽  
Size Dependent
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