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  • 1
    Electronic Resource
    Electronic Resource
    Highly irregular stacking structure in r-BN pressed up to 7.7 GPa at room temperature (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 4241-4245 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structural evolution in rhombohedral-type boron nitride (r-BN) pressed up to 7.7 GPa at room temperature is examined before and after pressing using high-resolution transmission electron microscopy. In the starting state, r-BN is in a platelike form with some folding. The plates consist of an almost perfect 3R structure. After pressing, a large number of stacking faults is formed and causes mixing of 3R and 2H in a few areas and a highly irregular stacking structure in most areas. This means that the coherent slip due to shearing between sp2 sheets is the dominant deformation mechanism in r-BN under high pressure at room temperature. All of these structures cause a broadening of the x-ray diffraction peaks. In some plates, the 2H structure is found in a relatively large area. It has a hexagonal lattice with the stacking sequence of ...ABAB... and lattice constants of a=0.25 nm and c=0.67 nm. The structural evolution in r-BN revealed after pressing is in contrast to that in hexagonal-type BN, in which twinning is the dominant deformation mechanism that introduces the folding of plates under high pressure at high temperature. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366230
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  • 2
    Electronic Resource
    Electronic Resource
    Modulated-Crystal Model for the Twelvefold Quasicrystal Ta62Te38 (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 634-637 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A transmission electron microscopy study reveals that the so-called twelvefold quasicrystal Ta62Te38 is a crystal subjected to structure modulation. It is composed of two incommensurate layers rotated by 30° to each other about their normal. High-resolution electron microscope images show the formation of commensurate domains and their discommensuration. The observed electron diffraction patterns may be explained by a kinematical calculation for the commensurate cell, designated as a 7 × 7 cell. The modulation is considered to be due to the rearrangement of atomic vacancies in response to the occurrence of charge-density waves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889898003008
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Phases with fluorite superstructures in the pseudo-ternary system PbO-Bi2O3-TeO2 (1990)
    Springer
    Journal of materials science 9 (1990), S. 580-582 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00725883
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  • 7
    Electronic Resource
    Electronic Resource
    Involvement of polyamines in gibberellin-induced development of seedless grape berries (1998)
    Springer
    Plant growth regulation 25 (1998), S. 187-193 
    Details
    ISSN: 1573-5087
    Keywords: gibberellic acid ; grape berry development ; putrescine ; spermidine ; spermine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The roles of polyamines (PAs) in the development of seedless grape berries induced by gibberellin (GA3) was investigated. The development of seedless grape berries was stimulated by the application of putrescine (Put), but not by that of spermidine (Spd) and spermine (Spm), regardless of the presence of GA3. At harvest, the fresh weight of seedless grape berries treated with 500 ppm Put + 25 ppm GA3 and 500 ppm Put increased to 111 and 112%, respectively, of the control. Treatment with methylglyoxal-bis (guanyl hydrazone), a potent inhibitor of S-adenosylmethionine decarboxylase that plays a role in Spd and Spm synthesis, did not affect the development of seedless grape berries induced by 100 ppm GA3. The application of 100 ppm GA3 significantly increased endogenous free Put levels. Levels of free Spd and Spm were not affected by GA3. Although the levels of endogenous perchloric acid insoluble bound PAs were higher than those of free PAs, obvious changes in the levels of bound PAs were not observed. These results indicate that free Put is implicated in the development of seedless grape berries induced by GA3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006043116190
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  • 8
    Electronic Resource
    Electronic Resource
    Competition between superconductivity and insulating magnetic state in κ-(BEDT-TTF)2Cu[N(CN)2]Cl: Effects of pressure, magnetic field, and partial anion substitution (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 937-941 
    Details
    ISSN: 1572-9605
    Keywords: Organic superconductor ; reentrant superconductivity ; temperature-pressure phase diagram ; magnetic-field-induced phase transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Systematic experimental study of the electrical transport and static magnetization reveals a direct and delicate interplay between magnetism and superconductivity in the organic materialκ-(BEDT-TTF)2Cu[N(CN)2]Cl, displayed through the specific temperature-pressure phase diagram, and such new effects for organic solids as the reentrant superconductivity in zero applied magnetic field and high-field-induced interchange between superconductivity and the nonmetallic resistive phase in the high-pressure region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00732275
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  • 9
    Electronic Resource
    Electronic Resource
    Morphology and microstructure investigations of YB66 nano-particles prepared by plasma chemical process (1998)
    Springer
    Journal of materials science 33 (1998), S. 4141-4145 
    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 Nanocrystalline particles of YB66 were prepared by plasma chemical process, using starting powders of YB4 and B, and the morphology was examined by high-resolution transmission electron microscopy (HRTEM). The average grain size of the YB66 particles is less than 100 nm. All the YB66 nano-particles are cubic in shape, suggesting that they have been formed through a direct coagulation from a vapor phase. Facetting at the cube corners occurs in most particles. The [0 0 1] and [0 1 1] lattice images of a cubic particle with edge-length of 84 nm were obtained. The simulated and experimental images match very well. A considerable amount of coarse, nearly spherical YB6 particles and unreached boron were additionally found by HRTEM. © 1998 Kluwer Academic Publishers
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004453103149
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructures in High-Tc Bi-based Superconductors (1998)
    Springer
    Journal of sol gel science and technology 13 (1998), S. 229-232 
    Details
    ISSN: 1573-4846
    Keywords: microstructure ; high-Tc Bi-based superconductor ; electron microscopy ; sol-gel ; preparation ; amorphization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Microstructures of high-Tc Bi-based superconductors in a disk form and a tape form sheathed by Ag are examined by SEM and TEM. The disk specimens were prepared by the sol-gel method and are compact with few cavities. Bi-2212 or Bi-2223 grains grow with short heating times leading to rapid increases in magnetization. However, magnetization drops with further heating due to the formation of 2201 areas in the 2212 matrix or 2212 areas in the 2223 matrix together with the amorphization within the matrix. In the tape specimens prepared by conventional powder processing methods, thin plate-like grains grow large with some cavities among them. The Jc increases together with the grain growth and then drops slowly as the amorphization of the grains occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008617203463
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