Edgar C Vigueras | Instituto Politécnico Nacional (original) (raw)
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Papers by Edgar C Vigueras
Philosophical Magazine A-physics of Condensed Matter Structure Defects and Mechanical Properties, 2001
In this paper, the regularities of dislocation pattern formation in single layer heterostructures... more In this paper, the regularities of dislocation pattern formation in single layer heterostructures with low lattice mismatch (f < 1%) are reviewed. The main attention is focused on the recently suggested mechanisms of dislocation nucleation and multiplication. An evolution of dislocation pattern from regular flat misfit dislocation network to the dense three-dimensional one was found to proceed during the epitaxial growth. Experimentally found regularities of dislocation structure formation are treated in terms of the influence of the nature of materials contacting at the interface upon the dislocation behavior. Special emphasis is given to the role of microsegregations and selfpoint defects in the alloy matrix in dislocation generation, propagation and multiplication.
Philosophical Magazine A-physics of Condensed Matter Structure Defects and Mechanical Properties, 2001
In this paper, the regularities of dislocation pattern formation in single layer heterostructures... more In this paper, the regularities of dislocation pattern formation in single layer heterostructures with low lattice mismatch (f < 1%) are reviewed. The main attention is focused on the recently suggested mechanisms of dislocation nucleation and multiplication. An evolution of dislocation pattern from regular flat misfit dislocation network to the dense three-dimensional one was found to proceed during the epitaxial growth. Experimentally found regularities of dislocation structure formation are treated in terms of the influence of the nature of materials contacting at the interface upon the dislocation behavior. Special emphasis is given to the role of microsegregations and selfpoint defects in the alloy matrix in dislocation generation, propagation and multiplication.
Philosophical Magazine A, 2001
The electron drag force on a moving dislocation in a magnetic field H introduces a sharp maximum ... more The electron drag force on a moving dislocation in a magnetic field H introduces a sharp maximum in the drag stress when H is parallel to the dislocation line (tilt-effect). The width of this maximum is proportional to the radius of the effective electron-dislocation interaction which, in linear theory, is of the order of the Burgers vector b. However, by using a nonlinear approach to this interaction we show that this width is much larger than in the linear case, and is given by the parameter (b/R)1/3, where R is the cyclotron radius. The estimate for the width of the tilt-effect, obtained from the nonlinear approach, is in good agreement with the experimental results, unlike the width obtained from linear theory.
Philosophical Magazine A-physics of Condensed Matter Structure Defects and Mechanical Properties, 2001
In this paper, the regularities of dislocation pattern formation in single layer heterostructures... more In this paper, the regularities of dislocation pattern formation in single layer heterostructures with low lattice mismatch (f < 1%) are reviewed. The main attention is focused on the recently suggested mechanisms of dislocation nucleation and multiplication. An evolution of dislocation pattern from regular flat misfit dislocation network to the dense three-dimensional one was found to proceed during the epitaxial growth. Experimentally found regularities of dislocation structure formation are treated in terms of the influence of the nature of materials contacting at the interface upon the dislocation behavior. Special emphasis is given to the role of microsegregations and selfpoint defects in the alloy matrix in dislocation generation, propagation and multiplication.
Philosophical Magazine A-physics of Condensed Matter Structure Defects and Mechanical Properties, 2001
In this paper, the regularities of dislocation pattern formation in single layer heterostructures... more In this paper, the regularities of dislocation pattern formation in single layer heterostructures with low lattice mismatch (f < 1%) are reviewed. The main attention is focused on the recently suggested mechanisms of dislocation nucleation and multiplication. An evolution of dislocation pattern from regular flat misfit dislocation network to the dense three-dimensional one was found to proceed during the epitaxial growth. Experimentally found regularities of dislocation structure formation are treated in terms of the influence of the nature of materials contacting at the interface upon the dislocation behavior. Special emphasis is given to the role of microsegregations and selfpoint defects in the alloy matrix in dislocation generation, propagation and multiplication.
Philosophical Magazine A, 2001
The electron drag force on a moving dislocation in a magnetic field H introduces a sharp maximum ... more The electron drag force on a moving dislocation in a magnetic field H introduces a sharp maximum in the drag stress when H is parallel to the dislocation line (tilt-effect). The width of this maximum is proportional to the radius of the effective electron-dislocation interaction which, in linear theory, is of the order of the Burgers vector b. However, by using a nonlinear approach to this interaction we show that this width is much larger than in the linear case, and is given by the parameter (b/R)1/3, where R is the cyclotron radius. The estimate for the width of the tilt-effect, obtained from the nonlinear approach, is in good agreement with the experimental results, unlike the width obtained from linear theory.