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  • 1
    Electronic Resource
    Electronic Resource
    The study of zeolites by HVHREM
    Amsterdam : Elsevier
    Ultramicroscopy 39 (1991), S. 238-246 
    Details
    ISSN: 0304-3991
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Electrical Engineering, Measurement and Control Technology , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0304-3991(91)90203-I
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  • 2
    Electronic Resource
    Electronic Resource
    Electron microscope and diffraction study on the ordered structures of platinum-rich copper–platinum alloys (1974)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 7 (1974), S. 50-59 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The ordered structures of Cu–Pt alloys containing 65–78 at. % Pt have been investigated by a combined technique of selected-area electron diffraction and dark-field electron microscopy using thin foils prepared from bulk specimens, and three different types of ordered structure have been observed. Below the order–disorder transformation temperatures, alloys containing less than about 70 at. % Pt have the rhombohedral superlattice of the Cu3Pt5 type and those with more than 70 at. % Pt, the CuPt3-type superlattice with cubic symmetry. At lower temperatures, however, the orthorhombic superlattice is stable in the composition range from about 68 to 75 at. % Pt. On the basis of the present observations, a partial phase diagram around the composition CuPt3 has been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889874008697
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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
    Study of the ordered structures of the Au–Mn system by high voltage–high-resolution electron microscopy. III. Two-dimensional antiphase structure of Au3Mn type (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 282-288 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: High-resolution structure images of the 23.5 and 24 at.% Mn alloys annealed at 573 K were studied by 1 MV electron microscopy. It was shown that the 24 at.% Mn alloy consists of two-dimensional antiphase structure (2d-APS) of Au3Mn with the boundaries parallel to the (100) and (010) planes. The average domain sizes were measured as M1 = 1.04 and M2 = 2.41, and an orthorhombic structure model with M1 = 1 and M2 = 2.5 was proposed for the ideal structure of the 2d-Au3Mn. From the 23.5 at.% Mn alloy, the structures corresponding to the intermediate state between the 2d-Au3Mn and the 2d-APS(I), which consists of lozenge- and parallelogram-shaped domains and exists in the alloys with 21–23 at.% Mn, were observed. It was concluded that the statistical order of appearance of the stable ordered phases with increasing Mn content in the composition range of 20–24 at.% Mn is Au4Mn → Au22Mn6 → Au31Mn9 → 2d-APS(I) → 2d-Au3Mn (so called Watanabe structure).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988201200X
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Electron diffraction study of short-range-order diffuse scattering from disordered binary alloys (1977)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 33 (1977), S. 784-788 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A qualitative study was made by electron diffraction of the short-range-order diffuse scattering from disordered Au-Pd, α phase Au-Zn, and α phase Ag-Mg alloys. Twofold and fourfold splittings of diffuse maxima are observed at 100, 110 and equivalent positions on the diffraction patterns with the incident beam parallel to [001], in the composition ranges from about 28 to 62 at.% Pd for Au-Pd, from about 7 to 24 at.% Zn for Au-Zn and from about 11 to 28 at.% Mg for Ag-Mg systems. The separation of the split diffuse maxima increases monotonically with Pd, Zn or Mg content. The results can be interpreted with the Fermi-surface-imaging concept proposed by Krivoglaz. The variation with composition of the Fermi wave vector parallel to the [110] directions is discussed with the nearly-free-electron and the rigid-band models. The latter model is also applied to the experimental results for disordered Cu-Pd and Cu-Pt alloys reported by the present authors [Ohshima & Watanabe (1973). Acta Cryst. A29, 520-526].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739477001934
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of structure factors of disordered vanadium monoxide crystals by the intersecting-Kikuchi-line and critical-voltage methods (1974)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 30 (1974), S. 772-776 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The concentration of vanadium atoms at interstitial tetrahedral sites in disordered VO0.82 and VO1.20 crystals has been determined by use of both the intersecting-Kikuchi-line method and the critical-voltage method. It is shown that not only the structure factor but also the temperature factor can be determined by combining the two methods. From the structure-factor values obtained, the existence of interstitial vanadium atoms is confirmed for the disordered VO1.20, supporting the assumption that the defect cluster typical of the ordered phase persists in the disordered state, whereas the interstitial concentration in the disordered VO0.82 is found to be nearly zero. For VO1.20 and VO0.82 the values of 1.21 ± 0.12 and 1.05 ± 0.10 Å2 respectively at room temperature were obtained for the B factor which includes contributions from static atom displacements as well as the effect of thermal vibrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739474001860
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  • 9
    Electronic Resource
    Electronic Resource
    X-ray diffraction study of short-range-order diffuse scattering from disordered Cu–29.8 at.% Pd alloy (1976)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 32 (1976), S. 883-892 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The diffuse X-ray scattering from a single crystal of disordered Cu-29.8 at. % Pd alloy was measured at room temperature. A fourfold splitting of the diffuse scattering due to short-range order was observed at the 110 reciprocal lattice point, in good agreement with the result previously obtained by electron diffraction. With the use of the method proposed by Boric & Sparks [Acta Cryst. (1971), A27, 198-201] the short-range-order parameters were determined by separating the other components of the diffuse scattering, i.e. size effect, Huang and thermal diffuse scattering, from the observed intensity data. It was revealed from this analysis that the order parameters beyond the 15th neighbour shell play an important role in characterizing this short-range-order diffuse scattering, although their magnitudes are small compared with those of the lower order parameters. Based on the ordering theory valid above the critical temperature the atomic-pair-interaction potential ratios were also obtained. It is shown that the pair-interaction potential is of long range and oscillates with distance. A comparison is made between the present result and the form of long-range oscillatory potential predicted by the conduction-electron screening model, and then the form of the Fermi surface is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739476001769
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  • 10
    Electronic Resource
    Electronic Resource
    Ordering and clustering of vacancies and interstitials in vanadium monoxide (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 205-205 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Ordering and clustering of defects in the vanadium–oxygen system in the composition range VO0.55–VO1.25 have been studied by several electron diffraction methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875010187
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