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  • 1
    Electronic Resource
    Electronic Resource
    Three Dimensional Electron-Positron Momentum Density in 2H-NbSe〈sub〉2〈/sub〉 (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 105-110 (Jan. 1992), p. 775-778 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.105-110.775.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Crystallographic study of cobalt treatment on γ-Fe2O3 : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6731-6733 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chemical analysis and x-ray diffraction measurements of samples during the reaction of cobalt treatment were carried out to study the mechanism of reaction. X-ray diffraction, TEM observation, and magnetic measurements of core γ-Fe2O3 and the modified particles were performed to investigate the crystal growth of cobalt ferrite on core γ-Fe2O3 particles. From chemical analysis of Fe2+ and total-iron ions in the reacting suspension and x-ray diffraction measurements of samples during the reaction, it is clear that the lattice constant becomes larger due to the formation of cobalt ferrite on core γ-Fe2O3 without decrement of Fe2+/total-iron ratio. So, cobalt ferrite on core γ-Fe2O3 particles is formed not by the oxidation of added Fe2+ ions, but by the electron transfer from Fe(OH)2 to core material. From x-ray diffraction measurements, I400/I311, I220/I311, and I111/I311 were calculated. While I400/I311 and I220/I311 are almost constant, only I111/I311 increases with increasing the amount of cobalt and ferrous ions added. These results show that cobalt ferrite is preferentially grown on (111) plane which is the close-packed plane of spinel lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352517
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic properties of modified Ba-ferrite particles : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5559-5561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Modification with magnetite on Ba-ferrite particles was carried out by heating alkaline suspension including Ba-ferrite particles and Fe2+ hydroxides as described by Kiyama et al. [J. Solid State Chem. 99, 329 (1992)] to get higher magnetization. As a result of x-ray powder diffraction measurements, reflection intensity of magnetoplumbite phase decreases and that of spinel phase increases with increase of Fe2+ quantity added, simultaneously. Coercive force goes down and magnetization increases as Fe2+ quantity added increases. The differential hysteresis loop of the mixed samples (Ba-ferrite particles and magnetite particles) has two peaks. And that of the modified samples has only one peak. From these results, it becomes clear that there exists strong magnetic interaction between Ba-ferrite core and magnetite shell. The measurements of temperature dependence of magnetization at the applied field of about 16.5 kA/m shows that the Hopkinson peak shifts toward higher temperature with increase of the modified amount. It also indicates the strong magnetic interaction between core and shell materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355688
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  • 4
    Electronic Resource
    Electronic Resource
    Fabrication of an organic superlattice film by molecular beam deposition (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2826-2830 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A superlattice film of 5, 10, 15, 20 tetraphenylporphyrin (H2TPP; C44H30N4) and 5, 10, 15, 20 tetraphenylporphyrinato zinc (ZnTPP; C44H28N4Zn) was grown on a hydrogen terminated surface of Si (100) wafer which was kept at −25 °C. The organic molecular beam deposition technique was used for the fabrication under ultrahigh vacuum between 3×10−9 and 3×10−10 Torr. The small angle x-ray diffraction study has revealed that the period of the superlattice was 4.4 nm, which was also confirmed by the oscillation of the same period observed in a secondary ion mass spectrometry depth profile of Zn. The Fourier-transform infrared spectroscopy measurement indicated that the quasi-planar molecules of H2TPP and ZnTPP were inclined at an angle of 70° with respect to the substrate surface. The film surface was very flat and any roughness could not be detected by field emission secondary electron microscope observation. An atomic force microscope (AFM) therefore was used to investigate the surface. The root mean square roughness calculated from the AFM image was 0.37 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353059
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of evaporated thin films of merocyanine dyes (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 237-240 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Vacuum evaporation of a merocyanine dye, 3-ethyl-5 [2-(3-ethyl-2-benzothiazolidene) ethyldene]-2-thioxo-4-thiazolidione, onto different substrates such as bare and surface-oxidized silicon wafers and a quartz glass substrate is done. There is a difference in color between a film deposited on the bare silicon substrate and one on either a quartz glass plate or a silicon wafer with a thick (96.5-nm) oxide layer. The dye film on quartz has an absorption maximum at 560 nm, whereas that on bare silicon has one at 582 nm. The bare crystalline silicon surface may give dye molecules more opportunity to aggregate than amorphous silicon dioxide or quartz surfaces. The dye molecules are preferentially oriented along the [100] direction of the substrate crystal, with the carbonyl group parallel to and the conjugated aromatic plane perpendicular to the substrate surface, although there is no detectable difference of orientation between the films deposited on these different substrates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345287
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of diamondlike carbon films by electron cyclotron resonance chemical vapor deposition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2890-2893 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamondlike carbon films were prepared by electron cyclotron resonance chemical vapor deposition. Structures of the carbon films were characterized by Raman spectroscopy and Fourier-transform infrared spectroscopy. The relationship between the properties of films and growth conditions has been examined. High-energy ion species extracted from a discharge of methane in the electron cyclotron resonance cavity, which is positively-biased electrically against the earthed substrate, have an important role in the growth behavior of hard diamondlike carbon films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345428
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal degradation mechanisms of liquid crystalline aromatic polyesters studied by pyrolysis-gas chromatography/mass spectrometry (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 29 (1991), S. 1903-1908 
    Details
    ISSN: 0887-624X
    Keywords: thermal degradation mechanism ; liquid crystalline aromatic polyester ; pyrolysis-gas chromatography ; mass spectrometry ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The thermal degradation mechanisms of liquid crystalline aromatic polyesters (LCPs) prepared from p-hydroxybenzoic acid (PHB), biphenol (BP), and terephthalic acid (TA) were studied by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The LCP containing deuterated terephthalate units and the LCPs that have different comonomer ratios were examined. On the basis of the pyrolysis products determined, the origin of the main pyrolysis products (benzene, phenol, biphenyl, phenyl benzoate, etc.) from the corresponding comonomer units were estimated and their thermal degradation mechanisms were eventually discussed in detail.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1991.080291309
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