Results 211 to 220 of about 34,619 (259)

Morphology of modulated crystals

Physica Status Solidi (a), 1994
Continuing three recent papers the basic principles of a theory to explain the occurrence of faces to be indexed with four integers (hklm) occurring on modulated crystals are explained. The theory is rooted in the higher than three-dimensional crystallography of Janner, Janssen, and de Wolff.
P. Bennema, M. Kremers, H. Meekes, M. Verheijen   +3 more
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Growth morphologies of crystal surfaces

Physical Review A, 1991
A previously proposed Monte Carlo model (Xiao et al., 1988, 1990) is extended to three dimensions, and reevaporation after accommodation and growth on dislocation-induced steps are included. It is found again that, for a given set of growth parameters, the critical size beyond which a crystal cannot retain its macroscopically faceted shape scales ...
, Xiao, , Alexander, , Rosenberger
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Quantification of crystal morphology

Journal of Crystal Growth, 1994
Abstract Morphological measurement constitutes an important experimental subject in crystal growth and materials science, and is currently receiving renewed attention because of the rapid advances occurring in computer technology, coupled with the concomitant sharp reductions in the cost of digital image processing.
M.E. Glicksman, M.B. Koss, V.E. Fradkov, M.E. Rettenmayr, S.S. Mani   +4 more
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Crystal Morphology and Crystal Symmetry

2003
Crystallography grew up empirically as a branch of mineralogy. It was supported by laws deduced from observations, such as the law of constancy of interfacial angles and the law of rational intercepts, and involved mainly the recognition, description, and classification of naturally occurring crystal species, that is, it was a study of the morphology ...
Mark Ladd, Rex Palmer
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Morphology of Oligomer Crystals

Proceedings, annual meeting, Electron Microscopy Society of America, 1973
Poly(ethylene terephthalate) (PET), contains approximately 1.5% oligomer (cyclic trimer). When films are heated the oligomers tend to migrate out and crystallize on the surface. The isolation and identification of oligomer has been reported; the crystal structure has been studied by x-ray and electron diffraction. Except for some optical work, however,
Y. T. Chen, E. A. Bartkus
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Morphologies of CVD ZrC Crystals

Physica Status Solidi (a), 1981
Particulate ZrC crystals of well-defined morphologies are formed by chemical vapor deposition from the ZrBr4–CH4–H2–Ar system. The basic forms are considered to be the prisms of 〈110〉axis having rhombic, pseudo-rhombic, and trigonal cross sections, which are bounded with four {111}, two {111} and two {110}, and two {111} and one {100} side faces ...
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Calcium oxalate crystal morphology

Trends in Plant Science, 2002
Plants invest considerable resources of carbon and calcium in crystal formation, indicating that it is an important basic process in growth and development. The diversity of crystal shapes, as well as their prevalence and spatial distribution, have led to several hypotheses regarding crystal function in plants.
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On the morphology of polymer crystals

Polymer, 1964
Abstract Crystals of isotactic poly-4-methylpentene-1 and of polyoxymethylene have been grown from dilute solution. The X-ray long period has been measured as a function of crystallization temperature for poly-4-methylpentene-1 in xylene and for polyoxymethylene in furfuryl alcohol.
D.C. Bassett, F.R. Dammont, R. Salovey
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The morphology of anthracene crystals

Journal of Crystal Growth, 1967
The prominent faces of anthracene single crystals grown from solution or from the vapour are those which correspond to planes with small reticular areas. The basal plane is usually dominant with the {110}, {101}, {111}, {112}, and {201} planes occurring to varying degrees depending on the mode of growth.
P.M. Robinson, H.G. Scott
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Dehydration of nigeran crystals: Crystal structure and morphological aspects

Journal of Molecular Biology, 1979
Abstract The crystal structure of anhydrous nigeran, poly[(1 → 3)-α- d -maltose], obtained from Penicillium crustosum has been determined by a combined electron diffraction. X-ray diffraction and packing analysis. The electron diffraction pattern from solution-grown single crystals shows some (h k I) reflections in the baseplane pattern.
Perez, S., Roux, M., Revol, J.F., Marchessault, R.H.   +3 more
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