scholarly journals Dopant-vacancy cluster formation in germanium

2010 ◽  
Vol 107 (7) ◽  
pp. 076102 ◽  
Author(s):  
A. Chroneos
Keyword(s):  
Cluster Formation ◽  
Vacancy Cluster

Point Defect Interactions and Vacancy Cluster Formation in Alkali Halide Crystals

1992 ◽  
Vol 134 (2) ◽  
pp. 351-358 ◽  
Author(s):  
A. V. Gektin ◽  
V. Ya. Serebryanny ◽  
N. V. Shiran
Keyword(s):  
Point Defect ◽  
Alkali Halide ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Defect Interactions ◽  
Alkali Halide Crystals

scholarly journals Molecular dynamics simulation of vacancy cluster formation in β- and α-Si3N4

2020 ◽  
Vol 178 ◽  
pp. 109632
Author(s):  
E. Adabifiroozjaei ◽  
S.S. Mofarah ◽  
H. Ma ◽  
Y. Jiang ◽  
M. Hussein N. Assadi ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Dynamics Simulation

Effect of Alloy Composition & Helium ion-irradiation on the Mechanical Properties of Tungsten, Tungsten-Tantalum & Tungsten-Rhenium for Fusion Power Applications

2013 ◽  
Vol 1514 ◽  
pp. 99-104 ◽  
Author(s):  
Christian E. Beck ◽  
Steve G. Roberts ◽  
Philip D. Edmondson ◽  
David E. J. Armstrong
Keyword(s):  
Mechanical Properties ◽  
Alloy Composition ◽  
Ion Irradiation ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Indentation Hardness ◽  
Fusion Power ◽  
Appreciable Difference ◽  
Alloy Content ◽  
Helium Ion

ABSTRACTModel alloys have been made of pure W and 1% & 5% W-Ta and W-Re. Indentation hardness and modulus data were obtained by nanoindentation to assess the effect of composition on mechanical properties. Results showed that both the Ta and Re compositions hardened with increasing alloy content, greater in the W-5%Ta composition which showed an increase of 1.03GPa (17%), compared to a 0.43GPa (7%) increase in W-5%Re. The samples also showed very small increases in modulus of ∼ 25GPa (6%) in both W-5%Re and W-5%Ta. The samples were implanted with 3000appm concentration of helium. All samples show a substantial increase in hardness of up to 107% in the case of pure W. An appreciable difference in modulus is also seen in all samples. Initial TEM work has shown no visible He bubbles, suggesting that the mechanical properties changes are due to He-vacancy cluster formation below the resolvable limit.

Effect of solute atom concentration on vacancy cluster formation in neutron-irradiated Ni alloys

2011 ◽  
Vol 417 (1-3) ◽  
pp. 963-967 ◽  
Author(s):  
Koichi Sato ◽  
Daiki Itoh ◽  
Toshimasa Yoshiie ◽  
Qiu Xu ◽  
Akihiro Taniguchi ◽  
...  
Keyword(s):  
Solute Atom ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Atom Concentration ◽  
Ni Alloys

Simulation of Vacancy Cluster Formation and Binding Energies in Single Crystal Germanium

2007 ◽  
Vol 994 ◽  
Author(s):  
Piotr Spiewak ◽  
Krzysztof Jan Kurzydlowski ◽  
Jan Vanhellemont ◽  
Piotr Wabinski ◽  
Krzysztof Mlynarczyk ◽  
...  
Keyword(s):  
Single Crystal ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Growth Patterns ◽  
Binding Energies ◽  
Effective Surface ◽  
Vacancy Clusters ◽  
Molecular Dynamics Calculations ◽  
Weber Potential ◽  
Effective Surface Energy

AbstractResults are presented of the simulation of the properties of vacancy clusters in single crystal germanium. Classical molecular dynamics calculations based on a Stillinger and Weber potential were used in a theoretical investigation of different growth patterns of vacancy clusters Vi. The formation and binding energies of vacancy clusters have been studied in the range 1 ≤ i ≤ 35. The energetically favourable growth mode and an estimate of the effective surface energy was determined for a vacancy clusters containing up to 35 vacancies

Temperature and Strain Rate Dependence of Deformation-Induced Point Defect Cluster Formation in Metal Thin Foils

2001 ◽  
Vol 673 ◽  
Author(s):  
K. Yasunaga ◽  
Y. Matsukawa ◽  
M. Komatsu ◽  
M. Kiritani
Keyword(s):  
Plastic Deformation ◽  
Strain Rate ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Long Tail ◽  
Vacancy Clusters ◽  
Thin Foils ◽  
Lower Strain ◽  
Wide Range ◽  
Deformation Speed

ABSTRACTThe mechanism of plastic deformation in thin metal foils without involving dislocations was examined by investigating the variations in vacancy cluster formation during deformation for a range of deformation speeds and temperatures. The deformation morphology was not seen to change appreciably over a very wide range of strain rate, 10-4/s – 106/s, whereas the number density of vacancy clusters was observed to increase with increasing strain rate up to saturation value that is dependent on materials and temperature. The density of vacancy clusters decreased to zero with decreasing deformation speed. The strain rate at which the density of vacancy clusters begins to decrease was found to be proportional to the vacancy mobility, suggesting that the vacancies are generated as dispersed vacancies and escape to the specimen surfaces during slow deformation without forming clusters. A very long tail in the distribution of the density of vacancy clusters towards lower strain rates was reasonably attributed to the generation of small vacancy complexes due to deformation. These results give valuable information that can be used to establish new models for plastic deformation of crystalline metals without involving dislocations.

Effect of different point-defect energetics in Ni80X20 (X=Fe, Pd) on contrasting vacancy cluster formation from atomistic simulations

Materialia ◽  
2021 ◽  
Vol 15 ◽  
pp. 100974
Author(s):  
Gaurav Arora ◽  
Giovanni Bonny ◽  
Nicolas Castin ◽  
Dilpuneet S. Aidhy
Keyword(s):  
Point Defect ◽  
Cluster Formation ◽  
Vacancy Cluster ◽  
Atomistic Simulations
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