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  • 1
    Digitale Medien
    Digitale Medien
    The application of surface dislocation theory to the f.c.c.–b.c.c. interface (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 34-40 
    Details
    ISSN: 1600-5724
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The formal theory of surface dislocations has been applied to the f.c.c.-b.c.c. interfaces defined by (111)F || (110)B. With the Bain correspondence between the two lattices, various theoretical models and experimental results on these interfaces have been analyzed. The results of the analysis suggest that preferred interface orientations can be explained on the basis that they are those of minimum or near-minimum Burgers-vector contents. This concept leads to an improved criterion for comparing the elastic component of interfacial energies. The limitations of geometrical models for predicting low-energy interfaces are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567739482000072
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  • 2
    Digitale Medien
    Digitale Medien
    The atomic scale structure and the electronic properties of a graded composition semiconductor layer (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1603-1607 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the results of a study on the relationship between the structural and electronic properties of a graded layer of undoped AlxGa1−xAs, where x was specified to increase linearly from 0 to 0.2 over 50 nm. The layer was grown by molecular-beam epitaxy between layers of doped GaAs. A high-resolution dark-field transmission electron microscopy imaging technique of combining information from 002 and 002¯ reflections of AlxGa1−xAs allowed us to image the graded region with near atomic resolution. Differences between the predicted and measured diode performance of the graded layer are discussed in the light of our results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339946
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  • 3
    Digitale Medien
    Digitale Medien
    Scanning electron acoustic microscopy of indentation-induced cracks and residual stresses in ceramics (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 1870-1872 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The ability of scanning electron acoustic microscopy (SEAM) to characterize ceramic materials is assessed. SEAM images of Vickers indentations in SiC whisker-reinforced alumina clearly reveal not only the radial cracks, the length of which can be used to estimate the fracture toughness of the material, but also reveal strong contrast, interpreted as arising from the combined effects of lateral cracks and the residual stress field left in the SiC whisker-reinforced alumina by the indenter. The strong contrast is removed after the material is heat treated at 1000 °C to relieve the residual stresses around the indentations. A comparison of these observations with SEAM and reflected polarized light observations of Vickers indentations in soda-lime glass both before and after heat treatment confirms our interpretation of the strong contrast.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104019
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  • 4
    Digitale Medien
    Digitale Medien
    Atom positions in the R-phase unit cell in TiNi shape memory alloy (1996)
    Springer
    Journal of materials science 31 (1996), S. 4227-4231 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract A crystallographic analysis of the atom positions in the unit cell of the R-phase of the TiNi shape memory alloy has been performed. In addition to a homogeneous shape change the atoms are found to shuffle in the [111]B2 and 〈−211〉B2 directions during the B2 to R-phase transformation. The origin of these shuffles is found to be a complex interaction between 〈110〉〈1–10〉 transverse acoustic and 〈111〉 longitudinal acoustic soft phonon modes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00356443
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  • 5
    Digitale Medien
    Digitale Medien
    The structure of {111} age-hardening precipitates in Al–Cu–Mg–Ag alloys (1988)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 207-227 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108768187012308
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  • 6
    Digitale Medien
    Digitale Medien
    Diffraction pattern simulations of quasiperiodic structures (1986)
    [s.l.] : Nature Publishing Group
    Nature 323 (1986), S. 313-317 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Although various models have been proposed, the details of the atomic structure of these icosahedral precipitates are still unclear. Shechtman and Blech2, for example, suggested that icosahedra could be linked by either their edges or their vertices and obtained a partial agreement with the ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/323313a0
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  • 7
    Digitale Medien
    Digitale Medien
    Evidence of hexagonal diamond in plasma-deposited carbon films (1994)
    Springer
    Journal of materials science 29 (1994), S. 4962-4966 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Hexagonal diamond grains of ∼30 nm diameter together with graphite and SiC are seen in predominantly amorphous carbon films deposited at low temperature on Si substrates from a CH4 plasma vapour source. The different crystalline phases are identified by grazing-angle X-ray diffraction which allows for substrate rotation and tilting to enable the 2θ peaks to be correlated with the angular displacements of specific planes. Electron energy-loss spectroscopy shows the chemical composition of the films to be predominantly carbon with traces of oxygen. Raman spectroscopy shows the peaks to be associated with amorphous carbon and graphite, together with a peak at 1170 cm−1 which is attributed to microcrystalline hexagonal diamond.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01151085
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