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  • Electronic Resource  (13)
  • 1990-1994  (5)
  • 1985-1989  (2)
  • 1980-1984  (6)
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  • Electronic Resource  (13)
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  • 1
    Electronic Resource
    Electronic Resource
    Textures in natural pyrolusite, β-MnO2, examined by 1 MV HRTEM (1986)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 42 (1986), S. 58-61 
    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/S0108768186098579
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of U–W oxides investigated by means of 1 MV high-resolution electron microscopy (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 575-579 
    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/S0108768183003006
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reduction in a niobium tungsten bronze, 2Nb2O5.7WO3, studied by 1 MV HRTEM (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 323-329 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: 1 MV high-resolution transmission electron microscopy (HRTEM) reveals that the reduction in a niobium tungsten bronze, 2Nb2O5.7WO3, is initiated by the release of a small amount of oxygen from the –M–O–M–O– strings in the pentagonal tunnels. Its content can be measured from the weight change. At the second stage of reduction the ordered structure of 2Nb2O5.7WO3 is destroyed, i.e. the ReO3-type structure at the center of the unit cell disappears. As a result an apparently disordered matrix appears, in which isolated unit cells of 2Nb2O5.7WO3 and 4Nb2O5.9WO3 are irregularly formed. At the third stage the microdomains of 4Nb2O5.9WO3 appear and grow. The presence of oxygen vacancies in the strings at each stage is revealed by the technique utilizing the knock-on of atoms by the impact of electrons. The number of knocked-on atoms is analyzed with the help of computer simulation on image contrast. Circular diffuse scattering is excited from the disordered matrix and its origin is related to the clusters composed of nine tunnel sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882012059
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Circular diffuse scattering from a niobium tungsten bronze, 3Nb2O5.8WO3, studied by 1 MV higher-resolution electron microscopy (1980)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 141-147 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A niobium tungsten bronze crystal with a nominal composition 3 Nb2O5.8WO3 gives circular diffuse scattering in the electron diffraction pattern. The diffuse rings change shape and size when the crystal is reduced at high temperature. The observations are explained by improving the cluster model proposed by De Ridder, Van Tendeloo, Van Dyck & Amelinckx [Phys. Status Solidi A (1977), 41, 555–560]; the present clusters are composed of nine pentagonal-tunnel sites. The 1 MV high-resolution electron microscope images reveal that the clusters have several different atomic arrangements and compositions. The relation between the clusters and the micro-domains, formed in the initial stage of long-range ordering, is clarified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889880011752
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  • 5
    Electronic Resource
    Electronic Resource
    Microstructure of U–Mo and U–W oxides investigated by means of high-resolution electron microscopy (1988)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 44 (1988), S. 821-827 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The potential of high-resolution electron microscopy (HREM) is demonstrated by the investigation of complex oxides with a general formula [UnMmO]- [MpO3p + l], M = (Mo, W). The HREM structure images of β-UMo2O8 agree well with the model derived from X-ray data. It is found that the γ- U3Mo20O64 sample considered earlier as a monophase appears in fact as a set of isostructural phases. The structure of these phases with MoO3 octahedral block width varying within p = 1-7 is derived from electron microscope images. Both regular and irregular substitution of cations and the formation of uranium vacancies in M-O rows are detected in γ-U3Mo20O64. Interstitial sites in the structures are detected, which can be occupied by extra U and W cations. The electron microscope images of vacancy rows give evidence for the finite length of some M-O rows. In this case oxygen dangling bonds at the ends of rows are supposed to be saturated by interstitial tungsten atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767388004374
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  • 6
    Electronic Resource
    Electronic Resource
    Modulation mechanism and disorder structure in hollandite-type crystals (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 405-413 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structural modulation in some hollandite-type crystals is explained by a vacancy-displacive modulation model. In this model the large cations located in the tetragonal channels along the c axis deviate from the average position to form a modulation wave. Three types of disorder in the initial phase of the modulation wave have been introduced to interpret apparently different diffraction patterns in hollandite-type crystals. A mathematical analysis as well as optical diffraction give results similar to those experimentally observed. High-resolution transmission electron microscope images have been observed to confirm the discussion further.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391001435
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  • 7
    Electronic Resource
    Electronic Resource
    Diffraction streaks from the chimney ladder structure in an (Sr1.5Ca1.5)Cu5+δOy crystal (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 727-735 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A crystal of (Sr1.5Ca1.5)Cu5 + δOy has been studied by means of electron diffraction analysis and high-resolution transmission electron microscopy. A chimney ladder structure has been identified in the crystal, which is composed of two sets of incommensurate orthorhombic sublattices L1 and L2 with a = a1 = a2 = 1.28, b = b1 = b2 = 1.13, c1 = 0.390 and c2 = 0.275 nm. Diffraction streaks have been observed in electron diffraction patterns, i.e. there is a set of reflection planes parallel to a*b* related to L2. A structure model with initial phase disorder has been proposed to explain such diffraction streaks. A mathematical inference as well as an optical diffraction method have confirmed this model. Observed high-resolution images together with calculated ones gave a direct verification for the initial phase disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391006591
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  • 8
    Electronic Resource
    Electronic Resource
    Irradiation-induced defects in β''-alumina examined by 1 MV high-resolution electron microscopy (1981)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 37 (1981), S. 51-61 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The defect blocks formed in β''-alumina by electron irradiation are examined by 1 MV high-resolution electron microscopy. In order to explain the fact that two distinctly different types of defect images appear even in a single 1 MV micrograph, a new structural model is constructed in place of the two models so far reported. In the model proposed, two spinel-like blocks on either side of the eliminated conduction plane are directly combined by the vectors including x, y components to form cubic close packing of oxygen layers in the resultant defect blocks. The arrangements of cations in the defect block are slightly different from those expected from the spinel structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739481000107
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  • 9
    Electronic Resource
    Electronic Resource
    Diffraction streaks due to phase disorder in one-dimensional displacive modulation (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 11-16 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: It can be proved mathematically that the initial phase disorder in the wave of a one-dimensional displacive modulation introduces additional variations in the structure of reciprocal space and, as a result, causes characteristic diffraction streaks. Using a simple two-dimensional model, the occurrence of such streaks is confirmed in optical diffraction patterns. Electron diffraction streaks from two crystals with incommensurately modulated structures are presented and explained as the diffraction effect of the phase disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390009059
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  • 10
    Electronic Resource
    Electronic Resource
    A sensitive and inexpensive high-performance liquid chromatographic assay for tyrosine hydroxylase (1981)
    Springer
    Cellular and molecular life sciences 37 (1981), S. 809-811 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We describe a highly sensitive assay method for tyrosine hydroxylase (TH) using high-performance liquid chromatography with amperometric determination. This assay method could be applicable to any tissues with low enzyme activity, such as rat cerebellum. We also describe the kinetic properties of TH in rat cerebral cortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985652
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