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  • 1
    Electronic Resource
    Electronic Resource
    Long-period ordered structures in the quasi-binary Co3V–Ni3V alloy (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 6 (1973), S. 273-279 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A series of long-period superstructures have been found in the quasi-binary Co3V–Ni3V system. These structures are specified by the stacking sequence of close-packed planes and the atomic order within the planes, and appear successively in the order 3\bar 3T (Co3V), (2\bar 1)3T, 1\bar 1T, 1\bar 1TR, 1\bar 1TR2, 1\barR, (3\bar 1)3R, 3\bar 3R and 1\bar 0R (Ni3V) with the increase of nickel concentration. The stabilization of the long-period structures is discussed briefly in terms of oscillatory interatomic potentials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889873008678
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  • 2
    Electronic Resource
    Electronic Resource
    Atomic ordering and lattice distortion in the zirconium–oxygen alloys with 28.2 and 29.2 at.% oxygen (1974)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 7 (1974), S. 67-73 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The structure of the interstitially ordered lattice formed in zirconium–oxygen alloys has been studied with use of single-crystal data obtained by X-ray and neutron diffraction methods. The structure belongs to space group P312 and the lattice parameters a and c are related to a0 and c0 of the host hexagonal metal lattice by a = √3a0 and c = c0. The ordered arrangement of interstitial oxygen atoms is described as a regular stacking of layers parallel to the (00.1) plane with the sequence (AC)B(AC)B... which is of the same type as that of nitrogen atoms in ε-Fe2N. The occupancy probability of oxygen atoms is high for interstitial sites of the A and B types while it is low for sites of the C type. The host metal lattice is distorted in such a way that spacings of successive (00.2) planes are not the same and a hexagonal network of atoms in these planes is periodically deformed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889874008727
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  • 3
    Electronic Resource
    Electronic Resource
    A study of the ordered structures of the Au–Mn system by high-voltage–high-resolution electron microscopy. II. Two-dimensional antiphase structures based on the DO22 structure (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 392-400 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Two-dimensional antiphase domain structures existing in the composition range 20–23 at.% Mn were investigated by a high-resolution structure-imaging technique with a 1 MV electron microscope. The structures are based on the DO22 structure and consist of parallelogram-shaped domains containing 4 × 3 columns of Mn atoms and lozenge-shaped domains with 4 × 4 and 3 × 3 columns, and the domains are separated by two-dimensional antiphase boundaries parallel to the ({\bar 2}40) and (240) planes of the fundamental face-centred structure. The configuration of the domains changes delicately with a slight change of composition or annealing temperature, and the symmetry of the structure is lowered below about 670 K. The ideal structure models have compositions of about 22.7 at.% Mn. The images of about half of the specimen area of the 22.6 at.% Mn alloy annealed at 570 K do not correspond to these new structures, but bear a resemblance to the image expected from the two-dimensional antiphase structure proposed by Watanabe [J. Phys. Soc. Jpn (1960), 15, 1030–1040] for Au3Mn, which is based on the L12 structure and has boundaries parallel to the (100) and (010) planes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009667
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  • 4
    Electronic Resource
    Electronic Resource
    Two-dimensional antiphase structure of Au4Mg studied by high-voltage–high-resolution electron microscopy (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 65-71 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new structure model of Au4Mg is proposed for the long-period superstructure which exists in the Au–Mg alloys with 16–22 at.% Mg at 570–470 K and gives electron diffraction patterns of the two-dimensional antiphase structure of Cu3Pd-type (2d–Cu3Pd), with the aid of high-resolution structure images taken with the 1000 kV electron microscope. The superlattice has monoclinic symmetry with the space group P21/m (No. 11), and the lattice parameters are A = 5a, B = b, C = 4c and β = 90°, where a(= b) and c(∼a) are those of the fundamental face-centred cell. The structure can be described as the two-dimensional antiphase structure having the first- and second-kind boundaries parallel to (001) and (100), respectively, and the domain size of 2.5a × b × 2c. Nearest-neighbour Mg atom pairs are not formed across the second-kind boundaries in this structure, in contrast with the ideal 2d-Cu3Pd-type structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882011364
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  • 5
    Electronic Resource
    Electronic Resource
    Double hexagonal superstructure of Au–Mg alloy containing 20 at.% Mg studied by high-voltage high-resolution electron microscopy (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 233-238 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: High-resolution observations of Au–20.2 at.% Mg alloy have been carried out by using a 1 MV electron microscope. The many-beam images with the [001] axial illumination are interpreted in terms of the double hexagonal superstructure of 9a0−4H type. With the aid of computer simulations by the multislice method, it is revealed that two kinds of interpretable image are obtained for different specimen thicknesses at the optimum defocus. The imaging conditions are discussed in comparison with the orthorhombic structure of the D023 type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889883010298
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  • 6
    Electronic Resource
    Electronic Resource
    Convergent-beam and small-area-parallel-beam electron diffraction patterns of icosahedral quasicrystals of an Al74Mn20Si6 alloy (1987)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 494-501 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876818709743X
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  • 7
    Electronic Resource
    Electronic Resource
    Long-period stacking order of oxygen atoms dissolved in α-zirconium near the composition ZrO1/3 (1970)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 3 (1970), S. 319-328 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Ordered arrangements of oxygen atoms dissolved in α-zirconium near the stoichiometric composition ZrO1/3 have been investigated by means of electron diffraction and dark-field electron microscopy. The arrangements of oxygen atoms are specified as the long period stacking sequences of the interstitial layers of octahedral sites normal to the c axis of the h.c.p. lattice. Eight kinds of the stacking variants of the oxygen layers are found in the composition range from 24 to 26 at.% O in the order of 8H (7\overline 1), 5H (4\overline 1), 12R (3\overline 1)3, 7H (3\overline 12\overline 1), 10H (1\overline 31\overline 13\overline 1), 9R (2\overline 1)3, 12H (1\overline 31\overline 11\overline 13\overline 1) and 14H (1\overline 13\overline 11\overline 11\overline 31\overline 1) or (1\overline 31\overline 11\overline 11\overline 13\overline 1). These stackings become irregular by quenching from about 600°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889870006362
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  • 8
    Electronic Resource
    Electronic Resource
    The formation of varieties of carbon ordering in pseudobinary compounds of V2C, Nb2C and Ta2C (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 17-23 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Ordering of carbon atoms in (V1 − xNbx)2C, (Nb1 − xTax)2C and (V1−xTax)2C has been studied by electron diffraction. In addition to three basic structures of V2C (ζ-Fe2N type), Nb2C and Ta2C [anti-Cd(OH)2 type], two superstructures are found at intermediate compositions of (V1 − xTax)2C. One of them appears also in (V1 − xNbx)2C at x = 0.2–0.5 and the other in (Nb1 − xTax)2C at x = 0.1–0.5. In these five structures, carbon atoms are aligned along the c axis occupying alternate octahedral interstices in the h.c.p. metal cell. The existence conditions of these structures are interpreted by a pairwise interaction model regarding the carbon atom-vacant interstice rows parallel to the c axis. The interaction energies for these rows up to the third-neighboring pairs are estimated from diffuse-scattering profiles observed on the specimens quenched from high temperatures. The results are discussed in comparison with the theoretical proposals for the ground-state structures based on a triangular-lattice gas model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880011442
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  • 9
    Electronic Resource
    Electronic Resource
    High-voltage, high-resolution electron microscopy of Au–Cd alloys. III. One-dimensional long-period superstructure of DO23 type (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 185-190 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A one-dimensional long-period superstructure (1d − LPS) of Au–24 at.% Cd alloy has been investigated at the atomic level with a 1 MV electron microscope. Simple images interpretable in terms of the 1d − LPS of DO23 type are observed; the cadmium atom positions appear as a regular out-of-step configuration of bright dots with the spacing of the lattice constant (4.1 Å) of the basic f.c.c. cell. This is called a superstructure image. The formation of the superstructure image is studied as functions of specimen thickness and defocus on the basis of n-beam multislice calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009096
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  • 10
    Electronic Resource
    Electronic Resource
    Single-crystal X-ray diffraction study on the hydrogen ordering in Ta2H (1978)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 11 (1978), S. 681-683 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A crystal of Ta2H with a single ordered domain has been prepared by the reaction of hydrogen gas with a tantalum single-crystal. Precession and Weissenberg photographs show the superlattice reflections which are indexed in terms of an orthorhombic unit cell with lattice parameters A = a[2(1 +cos γ)]1/ 2, B = c and C = a[2(1−cos γ)]1/2, where a(= b) = 3.359, c = 3.398 Å and γ = 90.3° are the parameters of the host monoclinic tantalum lattice. Quantitative intensity measurements indicate that these reflections arise mostly from the systematic displacement of metal atoms caused by the ordered hydrogen arrangement. The amount of displacement has been determined as 0.086 Å, which is a little larger than a previous neutron diffraction result (0.057 Å) on Ta2D.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889878014260
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