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  • 1
    Electronic Resource
    Electronic Resource
    High-symmetry triple junctions in polycrystalline silicon (1991)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 24 (1991), S. 232-238 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Triple junctions in polycrystalline silicon for solar cell applications have been studied by TEM (transmission electron microscopy). The typical characteristic of these junctions is the existence of high-symmetry interfaces, i.e. twins of different order. Whenever the triple junction contains two such interfaces, the intersection axis is a CSL (coincidence site lattice) symmetry axis. In this case the mutual relation of the grain boundaries of the triple junctions is revealed by symmetry rules, since the boundaries are described by symmetry elements of the corresponding CSL which do not belong to the symmetry group of the parent lattice. Therefore, the different variant orientations of these CSL symmetry elements, implied by the symmetry of the lattice, are used for the study of triple junctions. A junction is geometrically characterized by the point-group-symmetry properties. The observations concern symmetrically different triple junctions of the same type of macroscopically stable grain boundaries and faceted and microfaceted interfaces. It is shown that in silicon the thermodynamically favored twins are combined by specific symmetry rules. The results are discussed in accordance with the possible growth mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889891000729
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Group-theoretical consideration of the CSL symmetry (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 440-445 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A theoretical analysis for the computation of the coincidence site lattice (CSL) symmetry is presented. It is shown that three types of symmetry elements can exist and each one can be found by properly using the CSL's rotation matrix of the smallest-angle description. Thus, from the existence of the subgroup H1, the order of which is directly connected with the number of the different orientations that the sublattice Λ11 can have, a low-symmetry H1 group implies more possibilities for the formation of the corresponding CSL. From the existence of the symmetry elements of the second type, the smallest-angle rotation matrix can be a symmetry element but only of the fourth or sixth order. From the third type of elements a connection between CSLs of different Σvalues can exist. Since the analytical form of this smallest-angle rotation matrix can be deduced for every crystallographic system, the procedure described here is of general use. Thus a new classification of the different CSLs is possible according to their symmetry group. This allows the study of the CSL model from the symmetry point of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385000939
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Use of the CSL symmetrically equivalent descriptions tables in the DSC lattice base computation (1985)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 41 (1985), S. 445-451 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A combination of analytical expressions and a knowledge of symmetry is employed for the displacement shift complete lattice (DSCL) base computation. The method is of general use and its application to cubic and hexagonal systems is given. Tables containing all the symmetrically equivalent descriptions of one and the same coincidence site lattice (CSL) as a function of one description are given for both cubic and hexagonal systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767385000940
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    CSL descriptions of rhombohedral twinning in TIBiTe2 (1992)
    Springer
    Journal of materials science 27 (1992), S. 1327-1331 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Rhombohedral twins of the ternary semiconductor TIBiTe2 have been studied and it has been found that they were either coherent or non-coherent. By an appropriate approximation of the rhombohedral angle by a pair of integersp andq, the rhombohedral twins can be described by the coincidence site lattice (CSL) model. Since the best description for reflection twins is to note the lattice plane (hkl) acting as a mirror plane, the (hkl) description has been used. It has been found that the coherent twins are described by a CSL with low multiplicity ∑, and the non-coherent ones by a CSL with high multiplicity ∑.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01142047
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    Paper (German National Licenses)
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