A lattice-dynamics model of the interaction of a dislocation with point defects

1984 ◽  
Vol 45 (8) ◽  
pp. 1337-1345 ◽  
Author(s):  
J.A. Caro ◽  
N. Glass
Keyword(s):  
Point Defects ◽  
Lattice Dynamics ◽  
Dynamics Model

scholarly journals Spin-lattice dynamics model with angular momentum transfer for canonical and microcanonical ensembles

2021 ◽  
Vol 103 (2) ◽  
Author(s):  
Mara Strungaru ◽  
Matthew O. A. Ellis ◽  
Sergiu Ruta ◽  
Oksana Chubykalo-Fesenko ◽  
Richard F. L. Evans ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Momentum Transfer ◽  
Lattice Dynamics ◽  
Dynamics Model ◽  
Angular Momentum Transfer ◽  
Spin Lattice

Effect of Self-Interstitial Diffusion Anisotropy in Electron-Irradiated Zirconium. A Cluster Dynamics Modeling

2005 ◽  
Vol 237-240 ◽  
pp. 659-664
Author(s):  
Frédéric Christien ◽  
Alain Barbu
Keyword(s):  
Point Defects ◽  
Thin Foil ◽  
Elastic Interaction ◽  
Dislocation Loops ◽  
Considerable Influence ◽  
Dynamics Modeling ◽  
Dynamics Model ◽  
Diffusion Anisotropy ◽  
Vacancy Loops ◽  
Transmission Electron

Irradiation of metals leads to the formation of point-defects (vacancies and selfinterstitials) that usually agglomerate in the form of dislocation loops. Due to the elastic interaction between SIA (self-interstitial atoms) and dislocations, the loops absorb in most cases more SIA than vacancies. That is why the loops observed by transmission electron microscopy are almost always interstitial in nature. Nevertheless, vacancy loops have been observed in zirconium following electron or neutron irradiation (see for example [1]). Some authors proposed that this unexpected behavior could be accounted for by SIA diffusion anisotropy [2]. Following the approach proposed by Woo [2], the cluster dynamics model presented in [3] that describes point defect agglomeration was extended to the case where SIA diffusion is anisotropic. The model was then applied to the loop microstructure evolution of a zirconium thin foil irradiated with electrons in a high-voltage microscope. The main result is that, due to anisotropic SIA diffusion, the crystallographic orientation of the foil has considerable influence on the nature (vacancy or interstitial) of the loops that form during irradiation.

Interpretation of MnF62− : Cs2SiF6 impurity ion spectra from a lattice dynamics model for Cs2SiF6

1980 ◽  
Vol 75 (1) ◽  
pp. 156-161 ◽  
Author(s):  
Howard H. Patterson ◽  
Zameer Hasan ◽  
Neil B. Manson
Keyword(s):  
Lattice Dynamics ◽  
Dynamics Model ◽  
Impurity Ion

Lattice dynamics of crystals with extended point defects

1969 ◽  
Vol 7 (18) ◽  
pp. 1371-1377 ◽  
Author(s):  
J. Oitmaa ◽  
A.A. Maradudin
Keyword(s):  
Point Defects ◽  
Lattice Dynamics ◽  
Extended Point

A Study of the Temperature-Dependence of Low-Frequency, Raman-Active Phonons in Stage-2 Graphite-K and Graphite-Rb Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
J. Giergiel ◽  
P. C. Eklund ◽  
R. Al-Jishi ◽  
G. Dresselhaus
Keyword(s):  
Phase Transitions ◽  
Raman Scattering ◽  
Temperature Dependence ◽  
Raman Spectra ◽  
Lattice Dynamics ◽  
Low Frequency ◽  
Frequency Region ◽  
Intercalation Compounds ◽  
Dynamics Model ◽  
Scattering Study

ABSTRACTWe report results from a Raman scattering study of stage 2 Graphite-Rb and Graphite-K in the low frequency region (ω < 150 cm-1) as a function of temperature (80K < T < 300K). Four features are seen in the 80K spectra and are interpreted in terms of a Born– von Kármán lattice dynamics model. The temperature-dependence of the Raman spectra is discussed in connection with reported phase transitions in stage 2 alkalimetal graphite compounds.

Lattice Dynamics Study of Anisotropic Heat Conduction in Superlattices

2000 ◽  
Vol 626 ◽  
Author(s):  
B. Yang ◽  
G. Chen
Keyword(s):  
Thermal Conductivity ◽  
Group Velocity ◽  
Lattice Dynamics ◽  
Phonon Scattering ◽  
Diffuse Interface ◽  
Phonon Confinement ◽  
Dynamics Model ◽  
Phonon Group Velocity ◽  
Anisotropic Heat Conduction ◽  
The Cross

ABSTRACTPast studies on the thermal conductivity suggest that phonon confinement and the associated group velocity reduction are the causes of the observed drop in the cross-plane thermal conductivity of semiconductor superlattices. In this work, we investigate the contribution of phonon confinement to the in-plane thermal conductivity of superlattices and the anisotropic effects of phonon confinement on the thermal conductivity in different directions, using a lattice dynamics model. We find that the reduced phonon group velocity due to phonon confinement may account for the dramatic reduction in the cross-plane thermal conductivity, but the in-plane thermal conductivity drop, caused by the reduced group velocity, is much less than the reported experimental results. This suggests that the reduced relaxation time due to diffuse interface phonon scattering, dislocation scattering, etc, should make major contribution to the in-plane thermal conductivity reduction.

The damage and healing of quartz under radiation at high temperatures

2019 ◽  
Vol 29 (6) ◽  
pp. 923-942
Author(s):  
Shuai Zhou ◽  
J Woody Ju
Keyword(s):  
Molecular Dynamics ◽  
High Temperature ◽  
High Temperatures ◽  
Point Defects ◽  
Potential Application ◽  
Healing Process ◽  
Dynamics Model ◽  
Radiation Induced ◽  
Damage Healing ◽  
Significant Attention

The effect of radiation on silica has attracted significant attention due to its potential application where radiation exists. However, the nature of the atomistic defects of quartz formed during the radiation-induced damage at high temperatures has not been fully elucidated. Molecular dynamics is adopted to investigate the damage-healing behavior of the quartz at high temperatures in this research. The ensuing diffusion and recovery of point defects in the irradiated specimen at high temperatures are simulated. The high temperature reduces the number of point defects. At 1400 K, all point defects are removed, while only some point defects are erased at 700 K. It is illustrated that the over-coordinated atoms are the main source of point defects at 300 K and 700 K. The temperature influences the configuration of point defects. The healing variable of the molecular dynamics model is subsequently developed to describe the healing process. The healing mechanisms of the irradiated specimen at high temperatures are summarized by analyzing the trajectories of atoms in detail. These results are helpful to understand the nature of radiation damage in quartz at high temperatures.

Sign in / Sign up

Export Citation Format

Share Document