Experimental confirmation of the peculiar behaviour of the coherent‐type twin boundaries in sphalerite crystals

Minchev, G.; Pramatarova, L.; Pődör, B.; Szabó, J.

doi:10.1002/crat.2170290816

Cited by 6 publications

(3 citation statements)

References 10 publications

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“…Minchev and co-workers used Makyoh to reveal differences of stress behaviour of coherent and incoherent grain-boundaries in GaSb crystals. 41 Laczik et al utilised MT to optimise the polishing technology of InP wafers. 42 More recent applications include use in optimising the grinding technology of Si wafers.…”

Section: Assessment Of Surface Quality Of Semiconductor Wafersmentioning

confidence: 99%

Makyoh topography: a simple yet powerful optical method for flatness and defect characterization of mirror-like surfaces

Riesz

2004

SPIE Proceedings

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Makyoh topography is an optical surface defect and flatness characterisation tool. Its operation principle is based on the whole-field reflection of a collimated beam and defocused detection. This paper reviews the history, the basic principles and applications of the method. The problem of quantitativity is discussed in detail and the solutions are described. The accuracy limits are discussed. Application examples are shown from semiconductor wafer processing and MEMS technology. Comparison is made to related optical and other topographic techniques.

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Section: Assessment Of Surface Quality Of Semiconductor Wafersmentioning

confidence: 99%

Makyoh topography: a simple yet powerful optical method for flatness and defect characterization of mirror-like surfaces

Riesz

2004

SPIE Proceedings

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“…Makyoh topography has mainly been used for the assessment of wafer fabrication processes [3,4]. However, the principle of the method renders itself for the study of deformations caused by large-area extended defects; an example is the study of grain-boundary stresses in sphalerite crystals [5]. The correct interpretation of the images requires a quantitative model.…”

Section: Introductionmentioning

confidence: 99%

Makyoh Topography for the Study of Large-Area Extended Defects in Semiconductors

Riesz

1999

phys. stat. sol. (a)

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“…However, it has been demonstrated that the method is sensitive enough to detect the surface fingerprints of extended defects as well, such as stresses of grain boundaries in GaSb crystals [6], swirl defects in p-Si [7], bunches of dislocation slip lines [1], misfit-induced stresses [8], and surface roughening induced by ion implantation [5]. The present contribution aims at a semi-quantitative analysis of the possibilities and limitations of MT for the detection of isolated and (quasi-) periodic surface defects.…”

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confidence: 99%

Makyoh topography for the studies of extended defects: possibilities and limitations

Riesz

2009

Phys. Status Solidi (c)

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The hydrolytic kinetic resolution of five glycidaldehyde acetal derivatives was examined using the recombinant Aspergillus niger epoxide hydrolase as biocatalyst. This could successfully be performed, at room temperature, using solely demineralised water as solvent and following a two‐phase methodology allowing us to operate at a global substrate concentration as high as 200 g/L in the reactor. The observed E values were shown to be modest to excellent, depending on the structure of the acetal moiety, indicating that it is possible to achieve this resolution very efficiently just by choosing the right substituents. Both the unreacted (R)‐epoxide and the formed (S)‐diol could thus be obtained in good to excellent ee (ee>99 % for the epoxide). For the best substrates, the reaction could be performed within a few hours by using a biocatalyst over substrate molecular ratio of about 9 to 10×10−4 mol %. The turnover frequency (TOF) as well as the total turnover number (TON) of the enzyme proved to be excellent as compared to chemical catalysts – reaching respectively values in the order of 6×102 mol sub/mol enz/min and 6×104 mol sub/mol enz. The space‐time yield of the best (two‐phase) reactor could thus reach a value as high as 56 g/L/hour. As a demonstration experiment, a 50‐g scale resolution of glycidaldehyde 2,2‐dimethyltrimethylene acetal was performed.

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Experimental confirmation of the peculiar behaviour of the coherent‐type twin boundaries in sphalerite crystals

Cited by 6 publications

References 10 publications

Makyoh topography: a simple yet powerful optical method for flatness and defect characterization of mirror-like surfaces

Makyoh topography: a simple yet powerful optical method for flatness and defect characterization of mirror-like surfaces

Makyoh Topography for the Study of Large-Area Extended Defects in Semiconductors

Makyoh topography for the studies of extended defects: possibilities and limitations

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