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  • 1
    Electronic Resource
    Electronic Resource
    Defects and interfaces in an epitaxial ZnO/LiTaO3 heterostructure (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 5107-5112 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: ZnO films were grown on a (011¯2) r-plane LiTaO3 substrate by electron cyclotron resonance-assisted molecular-beam epitaxy. The detailed structures of the interface and defects are investigated by high-resolution electron microscopy and image simulation. The epitaxial relationship was found to be [0001]ZnO(parallel)[01¯11]LiTaO3 and (112¯0)ZnO(parallel)(011¯2)LiTaO3. This epitaxial relationship corresponds to the c axis of ZnO parallel to the piezoelectric r-plane LiTaO3, which results in the enhanced electromechanical coupling factor. The interfaces were very smooth and structurally semicoherent with a comparative regular array of misfit dislocations at the interface accommodating a lattice mismatch of 9.49% when the incident electron beam is parallel to the [0001]ZnO(parallel)[01¯11]LiTaO3 direction. A high efficiency of transfer of acoustic energy across the interface is expected for surface acoustic wave devices with such an interface. The dominant defects commonly observed in ZnO films were found to be the type-I1 intrinsic stacking fault. The formation of stacking faults was shown to be growth kinetics on particular crystallographic planes during the initial stage of film growth. The effects of these defects and interfaces on electrical and optical properties for device applications are discussed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1313777
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  • 2
    Electronic Resource
    Electronic Resource
    Quantification in high-resolution electron microscopy with the imaging plate
    Amsterdam : Elsevier
    Ultramicroscopy 39 (1991), S. 50-57 
    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)90181-5
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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
    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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  • 7
    Electronic Resource
    Electronic Resource
    High-voltage, high-resolution electron microscopy of Au–Cd alloys. I. Hexagonal long-period superstructures near 30 at. % Cd (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 169-177 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The crystal structure of Au–Cd (30–32%) alloys has been studied at atomic level with a 1 MV electron microscope. The experimental images can be fitted well with many-beam dynamical calculations for the long-period superstructure (LPS) designated as 7a0−2H type. The structures with incommensurate periods consist of a number of domains of the 7a0−2H structure separated by antiphase boundaries which are composed of orthorhombic cells. The result demonstrates the potentiality of high-voltage, high-resolution electron microscopy for direct determination of the atomic arrangements in modulated structures of alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889881009072
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetization distribution in the mixed-phase state of hole-doped manganites (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 423 (2003), S. 965-968 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The effect of ‘colossal magnetoresistance’ (CMR) in hole-doped manganites—an abnormal decrease of resistivity when a magnetic field is applied—has attracted significant interest from researchers in the past decade. But the underlying mechanism for the CMR phenomenon is ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01715
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  • 9
    Electronic Resource
    Electronic Resource
    High-resolution images of ordered alloys by high-voltage electron microscopy (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 310-317 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The image formation of high-voltage, high-resolution electron microscopy of ordered alloys has been studied on the basis of many-beam dynamical diffraction theory. It is revealed that superstructure images are observable for a rather thick crystal when nearly kinematical relationships hold among certain beams of the superlattice reflections; these beams are almost in phase and have amplitudes proportional to their structure factors. Thickness dependences of the phase differences and the scattering amplitudes are calculated for the superstructure of D023 type of the gold-based alloys Au3X (X = Mg, Zn and Cd). The results are discussed in connection with the difference in atomic scattering factors of the constituents X. The contrast of the superstructure image is discussed in terms of the amplitude-phase diagram of the superlattice reflections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739482000679
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamical diffraction effects on high-resolution electron microscopy of ordered alloys (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 954-960 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Characteristic dynamical diffraction effects on high-resolution electron microscopy of perfectly and imperfectly ordered alloys are discussed using the multislice dynamical scattering theory. In contrast with short-range-ordered alloys, the scattering amplitude of the superlattice reflections of long-range-ordered alloys can be represented by a multiplication of the kinematical structure factor and the dynamical factor. It is shown that the dynamical factor does not depend on the ordered atomic arrangements, so the dynamical diffraction effect on the scattering amplitude of the superlattice reflections and also on the high-resolution superstructure images can be estimated through the dynamical factor as far as the alloy composition and the basic structure are known. The dynamical factor for Cu3Pd is calculated as a function of crystal thickness and reciprocal-lattice vector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767388007408
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