GRAIN BOUNDARIES AND ANTIPHASE BOUNDARIES IN GaAs

Cho, N.-H.; McKernan, Stuart; Wagner, David K.; Carter, C.B.

doi:10.1051/jphyscol:1988527

Cited by 9 publications

(13 citation statements)

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“…Thus, the observed Sˆ3 incoherent twin boundary should be a paratwin because the {111}, Sˆ3 coherent twin boundary must be an orthotwin with normal SiÐC bonds (Cho et al 1988). In this paper, we deal with only the paratwins.…”

Section: Atomic Modelsmentioning

confidence: 97%

“…A rigid-body translation of one grain relative to the other is an important part of the atomic relaxation of a grain boundary. The presence of a rigid-body translation along the common h111i direction was found in Au (Ichinose et al 1985), Ag (for example Ernst et al (1992)), Cu (for example ), Al (for example Medlin et al (1993)), Si (Ichinose et al 1986) and Ge (Bourret and Bacmann 1986), whereas no rigid-body translation was found for diamond (Zhang et al 1996), SiC (for example Pirouz and Yang (1990)), GaAs (Cho et al 1988) and InP (Echigoya et al 1998), or under diOE erent conditions for Au (Ichinose et al 1985), Al (PeÂ nisson et al 1991) and Si (Ichinose et al 1986). It was also pointed out that the translation state was sensitive to the environment of the boundary (Ichinose et al 1985).…”

mentioning

confidence: 94%

“…and Yamamoto 1994, Godon et al 1999, Tanaka et al 1999, GaAs (Cho et al 1988) and InP (Echigoya et al 1998) experimentally and theoretically. A rigid-body translation of one grain relative to the other is an important part of the atomic relaxation of a grain boundary.…”

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confidence: 94%

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Experimental and theoretical study of Σ=3 incoherent twin boundary in β-SiC

Tanaka¹,

Kohyama²

2002

Philosophical Magazine A

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The structures of three types of Sˆ3 incoherent twin boundary in b-SiC were studied by high-resolution electron microscopy (HREM) and theoretical calculations. Three types of Sˆ3 incoherent twin boundary consist of arrays of structural units composed of ®ve-, six-and seven-membered rings, although the kinds of structural unit cell and the features of the structural units change according to the lengths or circumstances of the boundaries. At the boundary six {111} planes wide, the array consists of aligned symmetric structural units composed of ®ve-, seven-and six-membered rings in that order and does not generate a rigid-body translation along the h111i direction. At the boundary 18 {111} planes wide, the array consists of both symmetric and asymmetric structural units, generating a translation along the h111i direction. At the boundary about 25 nm long and the inclined boundary, the array consists of zigzag or obliquely distributed symmetric structural units. It is known from the tight-binding calculations that the grain-boundary energy becomes lower when the Si site is reconstructed than when the C site is reconstructed. The grainboundary energy of the asymmetric structural unit composed of ®ve±seven±six-membered rings is lower than that of the symmetric structural unit; however, the diOE erence between these is small. The observed results of HREM can be explained in terms of the theoretical results.

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Section: Atomic Modelsmentioning

confidence: 97%

mentioning

confidence: 94%

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Experimental and theoretical study of Σ=3 incoherent twin boundary in β-SiC

Tanaka¹,

Kohyama²

2002

Philosophical Magazine A

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“…The low energy data are included in the present analysis in the manner which follows closely the approach presented in [5,21]. Therefore only basic assumptions are listed here 6 For results which are based on the sample of events selected with | cos θ| < 0.9, this factor is reduced to 0.70866... and technical details are omitted.…”

Section: Data From Low Energy Experimentsmentioning

confidence: 99%

“…The constraints from the µ ± C experiment result from the comparison of µ + L N and µ − R N cross sections. 8 This correction seems to be missing in [5,21].…”

Section: Data From Low Energy Experimentsmentioning

confidence: 99%

Global analysis of eeqq contact interactions and future prospects for high energy physics

Żarnecki

1999

Eur. Phys. J. C

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Data from HERA, LEP and the Tevatron, as well as from low energy experiments are used to constrain the scale of possible electron-quark contact interactions. Different models are considered, including the most general one, in which all new couplings can vary independently. Limits on couplings and mass scales are extracted and upper limits on possible effects to be observed in future HERA, LEP and Tevatron running are estimated. Total hadronic cross-section at LEP and e − p scattering cross-section at HERA are strongly constrained by existing data, whereas large cross-section deviations are still possible for Drell-Yan lepton pair production at the Tevatron.

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Leptoquark signal from global analysis

Żarnecki¹

2000

Eur. Phys. J. C

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Data from HERA, LEP and the Tevatron, as well as from low energy experiments are used to constrain the Yukawa couplings for scalar and vector leptoquarks in the Buchmuller-Ruckl-Wyler effective model. In the limit of very high leptoquark masses constraints on the coupling to the mass ratio l/M are derived using the contact-interaction approximation. For finite masses the coupling limits are studied as a function of the leptoquark mass. Some leptoquark models are found to describe the existing experimental data much better than the Standard Model. Increase in the global probability observed for models including S_1 or ~V_o leptoquark production/exchange corresponds to more than a 3 sigma effect. Assuming that a real leptoquark signal is observed, calculated is an allowed region in the l-M plane. The leptoquark signal is mostly resulting from the new data on the atomic parity violation in cesium, but is also supported by recent LEP2 measurements, unitarity violation in the CKM matrix and HERA high-Q^2 results.Comment: Updated for DIS'2000, Liverpool, April 25-30,2000; 33 pages, 8 figures, 4 table

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GRAIN BOUNDARIES AND ANTIPHASE BOUNDARIES IN GaAs

Cited by 9 publications

References 0 publications

Experimental and theoretical study of Σ=3 incoherent twin boundary in β-SiC

Experimental and theoretical study of Σ=3 incoherent twin boundary in β-SiC

Global analysis of eeqq contact interactions and future prospects for high energy physics

Leptoquark signal from global analysis

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