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  • 1
    Electronic Resource
    Electronic Resource
    A metastable ion study of the electron impact fragmentation of some substituted 2,6-pyrido-containing crown ethers (1987)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 22 (1987), S. 633-636 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Extensive networks of metastable ions link the major peaks in the electron impact mass spectra of two crown ethers containing 2,6-pyrido units. High-resolution mass measurements and the metastable peaks allow the elucidation of the fragmentation pathways. The spectra are influenced more by the presence of aromatic substituents than by the 2,6-pyrido units.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210220911
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  • 2
    Electronic Resource
    Electronic Resource
    Translational diffusion of poly(methyl methacrylate) in acetone: wormlike vs. freely jointed chain model (1987)
    s.l. : American Chemical Society
    Macromolecules 20 (1987), S. 138-142 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00167a023
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  • 3
    Electronic Resource
    Electronic Resource
    Adhesion and deformation of metal/polyimide layered structures (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 1911-1917 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Adhesion and interfacial failure of Cr, Cu, and Cu/Cr films on a thin pyromellitic dianhydride-oxydianiline polyimide substrate have been investigated using a recently developed stretch deformation technique. This method directly measures the energy required to separate the interface from the difference in the load versus elongation curves between film/substrate and substrate structures. The failure mode was observed in combination with morphological studies by in situ optical microscopy and scanning and transmission electron microscopies. The stress distribution in the sample upon stretching has been computed by a finite element analysis. The difference in the stress relief modes, film fracture, and delamination behavior for Cu versus Cr films is discussed. The important role of crack formation in the metal overlayer for initiating failure is demonstrated. The effects due to the addition of a brittle Cr interface layer between polyimide and Cu on the buildup of stress and the onset of failure have also been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342903
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic properties and microstructure of magnesium-doped Nd-Fe-B magnets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5513-5515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A number of Nd15 Fe79−x Mgx B6 magnets with x up to 0.41 and pseudoternary Nd2(Fe1−yMgy)14B compounds with y up to 0.081 have been prepared by conventional powder metallurgy processes. Magnetic measurements indicate that for the magnet alloys i Hc increases as x increases up to 0.25 without a loss in Br, hence the (BH)max values are slightly enhanced. The maximum increase in i Hc is about 15% for x=0.25. Extensive Mg-rich precipitates inside the Nd-rich phase have been observed by electron probe microanalysis (EPMA). Higher Mg intensity at grain boundaries is also detected by EPMA. The reasons for the i Hc increase might be the grain boundary cleaning ability of Mg dopant. For the pseudoternary compounds, the anisotropy field HA is found to increase only slightly due to Mg doping while TC remains practically unchanged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342320
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence for 2D XY Kosterlitz-Thouless transitions in magnetic graphite intercalation compounds (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 4398-4400 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic graphite intercalation compounds (GIC's) allow a controlled separation of atomically abrupt magnetic layers by variation of the stage of the sample. Thus very small J'/J values (∼10−4) and quasi-two-dimensional behavior can be achieved where J' and J are, respectively, the interplanar and intraplanar exchange constants. The applicability of a 2D XY model is established by a comparison of the high-temperature susceptibility with the high-temperature series expansions for the various 2D and 3D models. Low-temperature studies provide values for magnetic interactions pertinent to the most interesting intermediate temperature range, where a 2D XY bound vortex phase may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338437
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of krypton on CrSi2 formation (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 59 (1986), S. 1998-2001 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence and redistribution of the inert gas Kr in chromium silicide formation have been investigated by MeV He backscattering spectrometry and transmission electron microscopy. It was found that krypton implanted in the chromium film remains stationary with respect to the chromium during silicide formation, but krypton implanted in the silicon substrate accumulate at the silicon/silicide interface. The effect of krypton on the rate of silicide formation is much more pronounced when the krypton is in the chromium rather than in the silicon substrate. The thermal growth of CrSi2 is linear with time in a krypton-free sample, but becomes parabolic when the krypton is incorporated in the silicide at a concentration of 1 at. %. The activation energy associated with Si diffusion through CrSi2 is increased from 1.4±0.1 eV to 2.6±0.1 eV by the presence of krypton in the silicide. The results are interpreted as being due to segregation of krypton on grain boundaries in CrSi2 and subsequent retardation of diffusion along the boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336379
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and magnetic properties of pseudoternary Nd2(Fe1−xCux)14B compounds (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2739-2741 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on new pseudoternary compounds Nd2(Fe1−xCux)14B in order to study the systematic variation of magnetic properties with Cu substitution. X-ray powder diffraction data indicate that the tetragonal Nd2Fe14B-type phase exists only for x≤0.05. Partial replacement of Fe by nonmagnetic Cu significantly decreases the saturation magnetization value with little change in ferromagnetic Curie temperature TC. Low-temperature spin orientation temperature (Tsr) decreases from 135 K for x=0.00 to 130 K for x=0.03, and 122 K for x=0.05, and the tilt angle of the easy magnetization direction from the tetragonal c axis decreases accordingly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340969
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  • 8
    Electronic Resource
    Electronic Resource
    The structure of Ni5Si2 formed in Ni-Si thin-film lateral diffusion couples (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1189-1194 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure of the nickel silicide, Ni5Si2, which forms during solid-state reactions using self-supporting Ni-Si lateral-diffusion couples, has been studied using high-resolution electron microscopy (HREM) and selected-area electron diffraction. Two different structures for Ni5Si2 have been identified, one of which is consistent with the crystal structure which has been reported to have an actual composition of Ni31Si12. There is evidence for the existence of a third structure. Variations in the distribution of these structures and the presence of planar defects may account for the reported composition range of Ni5Si2 in the Ni-Si phase diagram. The observed HREM images are compared with computer simulated images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339830
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  • 9
    Electronic Resource
    Electronic Resource
    Photoluminescence study of gallium antimonide grown by liquid-phase epitaxy (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 350-353 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low carrier concentrations of undoped p-type and Te-doped n-type GaSb epilayers have been grown on (100)-oriented Te-doped GaSb substrates by liquid-phase epitaxy with supersaturation and undersaturation techniques, respectively. The net carrier concentrations of undoped and Te-doped layers obtained by C-V measurement can be as low as NA −ND =8×1015 cm−3 and ND −NA =1016 cm−3 , respectively. These GaSb-grown layers were characterized by photoluminescence (PL) measurement. The native neutral acceptor transitions appear at 778.2 meV for undoped layers and 777.2 meV for Te-doped layers. The ionization energy for the Te donor in GaSb was determined to be 3.6 meV below the bottom of conduction band at 18 K. The relation between the energy gap of GaSb and temperature was obtained by PL measurement at various temperatures. The spin-orbit splitting of the valence band was measured to be 0.798 eV at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343880
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  • 10
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic properties of the permanent magnet systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5546-5548 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic and crystallographic measurements have been made on the rare-earth iron boride systems (R1−xScx)2Fe14B (R=Y, Nd, Dy, Er, Lu). Powder x-ray diffraction data indicate that a Nd2Fe14B-type single phase persists up to x=0.2 with lattice parameters decreasing slightly due to the smaller metallic radius of the Sc3+ ions. The variation of magnetic moments per formula unit with nonmagnetic Sc substitution depends on the smaller Sc size and the nature of the magnetic alignment of the rare-earth sublattice (nonmagnetic in Y and Lu, ferromagnetic axial in Nd, ferromagnetic planar in Er, and antiferromagnetic axial in Dy) with respect to the iron sublattice. The Curie temperature TC decreases monotonically with progressive addition of Sc atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342331
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