Dislocations in the diamond lattice

Hornstra, J.

doi:10.1016/0022-3697(58)90138-0

Cited by 531 publications

(148 citation statements)

References 10 publications

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“…At high temperatures, i.e. in the ductile regime, all observations agree that the plasticity of silicon is governed by dissociated screw and 60 • dislocations, composed respectively of two 30 • , or one 30 • and one 90 • Shockley partial dislocations [2,3]. The two partials are separated by an intrinsic stacking fault which can exist only in glide (111) planes.…”

supporting

confidence: 58%

Dislocation motion in silicon: the shuffle-glide controversy revisited

Pizzagalli

Beauchamp

2008

Philosophical Magazine Letters

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supporting

confidence: 58%

Dislocation motion in silicon: the shuffle-glide controversy revisited

Pizzagalli

Beauchamp

2008

Philosophical Magazine Letters

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“…The core consists of a pentaring and a heptaring (five-atom ring and seven-atom ring, respectively). Indeed, this is one of the core structures suggested by Homstra (1958) for edge dislocations on the {loo) plane, and is characterized by not containing any dangling bonds. Though Lomer dislocations in silicon often dissociate into Shockley partials, they have also been observed undissociated (Bourret et al 1982), which suggests that perfect Lomer dislocations are also stable.…”

Section: Bond Stretching Distribution (Thicknessmentioning

confidence: 83%

A harmonic/anharmonic energy partition method for lattice statics computations

Gallego

Ortiz

1993

Modelling Simul. Mater. Sci. Eng.

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A method of lattice statics analysis is developed. Consideration of anharmonic effects is reslricted to finite regions surrounding lattice defecls. All displacements of the nysral are expressed as the effect of unknown forces applied to a perfect harmonic lattice of infinite extent.Displacements are related m the unknown applied forces by means of the Green function of the perfect harmonic lactice. so that equilibrating forces need only be applied to the anharmonic region. The unknown forces are determined so as to maximize the complementary energy of the crjsral, which yields a lower bound to the potential energy. The method daes not require the explicit enforcement of equilibrium or compatibility conditions acmss the boundary beween the harmonic and anharmonic regions. The performance of the method is assessed on the basis of selected numerical examples. The rate of convergence of the method with increasing domain size is found to be cubic. This is one or two orders of magnitude faster than rigid boundary methods based on the harmonic and continuum solutions. respectively.

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“…16(a) is a maximum entropy image of a Lomer dislocation core viewed along [110] and situated near the interface in the CdTe(001)/GaAs(001) system (Angelo et al, 1993;McGibbon et al 1995a). From the columnar positions alone, it is clear that the core structure is unexpected in that it is asymmetric (best described as a four-fold ring surrounded by five distorted six-fold rings) and unlike the Hornstra model (Hornstra, 1958), a symmetric structure consisting of a seven-fold ring adjacent to a five-fold ring. Shown in Fig.…”

Section: Maximum Entropy Analysis Of Tetrahedral Compound Semiconductorsmentioning

confidence: 99%

Crystal structure retrieval by maximum entropy analysis of atomic resolution incoherent images

McGibbon

Pennycook

Jesson

1999

Journal of Microscopy

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SummaryIn this paper, we discuss the application of the maximum entropy method to atomic resolution Z-contrast images acquired in a scanning transmission electron microscope. Zcontrast is an incoherent imaging technique, and can be described as a convolution between an object function (the real-space map of the columnar scattering cross-section to high angles) and a point spread function (the effective electron probe). As such, we show that the technique is ideally suited to maximum entropy analysis which can, given an electron probe distribution, retrieve the 'most likely' Z-contrast object function. Using both simulated and experimentally acquired data, we explore the capabilities of maximum entropy analysis when applied to atomic resolution Z-contrast images, drawing conclusions on both the range of applicability of the technique and the nature of the retrieved crystal structures. Ultimately, we show the way in which the combination of Z-contrast imaging with maximum entropy analysis can be used to yield important information on unexpected atomic structures.

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Dislocations in the diamond lattice

Cited by 531 publications

References 10 publications

Dislocation motion in silicon: the shuffle-glide controversy revisited

Dislocation motion in silicon: the shuffle-glide controversy revisited

A harmonic/anharmonic energy partition method for lattice statics computations

Crystal structure retrieval by maximum entropy analysis of atomic resolution incoherent images

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