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  • 1995-1999  (6)
  • 1985-1989  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    High-resolution transmission electron microscopy of structural changes at and near surfaces of ZnTe crystals (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 125-128 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Structural changes on and near surfaces of ZnTe crystals were observed by the surface profile imaging method in a high-resolution transmission electron microscope (HRTEM) with 200 kV accelerating voltage. It was found that ZnO particles form under electron irradiation on surfaces originally covered with a thin amorphous layer. For amorphous coverages thicker than about 7 nm, ZnO particles were not observed. Under the ZnO particles, 2×1 and 2×2 superstructures (about 10 nm in size) were often found in the ZnTe matrix. These superstructures can be described as a metastable Zn2Te3 having a structure similar to the ordered Ga2Te3 structure. This change can be accomplished by considering the diffusion of zinc from the ZnTe matrix to the surface to form the oxide and evaporation of tellurium out of the surface, leaving behind a matrix with an altered stoichiometry. The HRTEM computer-simulated images for the proposed Zn2Te3 superstructure matched very well the experimental images. The 2×1 and 2×2 superstructures corresponded to the HRTEM images of the new Zn2Te3 structure viewed along its [211] and [100] directions, respectively. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360919
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth defects in GaN films on 6H–SiC substrates (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 2678-2680 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Lattice defects in GaN epilayers grown on 6H–SiC(0001) by metalorganic vapor phase epitaxy (MOVPE) have been characterized by transmission electron microscopy (TEM). The predominant defects in the film were threading dislocations and half-loops with Burgers vectors 1/3〈112¯0〉, [0001], and 1/3〈112¯3〉. Planar faults were also observed in the film that are thought to be inversion domain boundaries (IDBs). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116279
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bismuth–Molybdenum–Oxide Catalyst: a High-Resolution Transmission Electron Microscopy Study (1999)
    Springer
    Journal of materials science 18 (1999), S. 555-557 
    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/10.1023/A:1006634729812
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of oxide additive in silicon nitride on interfacial structure and strength of silicon nitride joints brazed with aluminium (1989)
    Springer
    Journal of materials science 24 (1989), S. 2865-2870 
    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 Silicon nitride ceramics with Y2O3 and Al2O3 as sintering additives were brazed with aluminium, and the brazed strength and the interfacial structure of the joints were compared with those of the joints made of additive-free silicon nitride ceramics. It is concluded that the additives in silicon nitride ceramics take part in the interfacial reaction, make the reaction layer thicker, and hence increase the brazed strength greatly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385639
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Interfacial strength and chemistry of additive-free silicon nitride ceramics brazed with aluminium (1989)
    Springer
    Journal of materials science 24 (1989), S. 2879-2883 
    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 Two kinds of additive-free silicon nitride ceramics were brazed with aluminium; one was with as-ground faying surfaces and the other was with faying surfaces heat-treated at 1073K for 1.8 ksec in air. The heat-treatment of the silicon nitride ceramics formed a silicon oxynitride layer on the faying surfaces and increased the brazing strength of the joints. A silica-alumina non-crystalline layer and a β′-sialon layer were formed successively from the aluminium side at the interface of the joints. The heat-treatment which made the former layer thicker is a necessary process in making reliable, strong brazed joints.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02385641
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  • 6
    Electronic Resource
    Electronic Resource
    Characterization of the whisker–matrix interfacial reactions in K2O·6TiO2 whisker-reinforced aluminium matrix composites (1997)
    Springer
    Journal of materials science 32 (1997), S. 543-547 
    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 The interfacial reaction at the whisker–matrix interface in a K2O·6TiO2/6061Al composite was investigated by high-resolution transmission electron microscopy. Magnesium segregation and titanium enrichment at the whisker–aluminium interface was revealed by energy-dispersive X-ray analysis. It was shown that TiO and MgTi2O4 layers and MgAl2O4 particles were formed at the whisker–aluminium interfaces in the composite during the manufacturing of the composite. The thickening of the reaction layer after T6 treatment may result in the decrease of the bending strength of the composite. Specific orientation relationships between MgTi2O4 and TiO, and also between TiO and K2O·6TiO2 whiskers were also found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018502811169
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    High-resolution transmission electron microscopy investigation of a stacking fault in β-Si3N4 (1997)
    Springer
    Journal of materials science 32 (1997), S. 1431-1436 
    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 High-resolution transmission electron microscopy images of stacking faults on (0 0 1) and (1 0 1) planes in a β-Si3N4 whisker were obtained and compared to image simulations. This procedure showed that the atomic structure of the four atomic planes around the (0 0 1) stacking fault plane in the β-phase is very similar to that of the unit cell of α-Si3N4 crystal. The stacking fault was observed to climb under electron irradiation in the microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018541631100
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Property-microstructure correlation in in situ formed Al2O3, TiB2 and Al3Ti mixture-reinforced aluminium composites (1996)
    Springer
    Journal of materials science 31 (1996), S. 741-747 
    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 The in situ formed Al2O3, TiB2 and Al3Ti mixture-reinforced aluminium composites were successfully fabricated by the reaction sintering of the TiO2-B-Al system in a vacuum. With increasing boron content in the TiO2-B-Al system, the amount of generated TiB2 in the composites increased and Al3Ti content decreased. At the same time the distribution uniformity of the in situ formed Al2O3 and TiB2 particulates was obviously improved, and the size of the Al3Ti particles was reduced. The in situ Al2O3 and TiB2 particulates had sizes from 0.096–1.88 μm. The interface between the in situ formed particulates and the aluminium matrix was clean, and no consistent crystallographic orientation relationship was found. The strength and elastic modulus of the composites was significantly improved by lowering the Al3Ti content. When the boron content in the TiO2-B-Al system rose, the morphology of the tensile fracture surface of the composites was changed from large fractured Al3Ti blocks and fine dimples, to fine dimples and pulled-out particulates. The strengthening and fracture of the composites have been modelled.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00367894
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    Paper (German National Licenses)
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