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  • American Institute of Physics (AIP)  (5)
  • 1990-1994  (5)
  • 1994  (5)
Document type
Publisher
  • American Institute of Physics (AIP)  (5)
  • Springer  (8)
Years
  • 1990-1994  (5)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Wet-process preparation of amorphous Y-Fe oxide films ferromagnetic at room temperature : 38th Annual Confrerence on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6094-6096 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Yttrium iron ferrite films of amorphous structure (as examined by x-ray diffraction), having ferromagnetic moment at room temperature, are successfully synthesized from an aqueous solution by a ferrite plating method in which the substrate is heated by Xe-lamp beams. The atomic ratio of Y/Fe in the films is adjusted to Y/Fe=0.6, as in Y3Fe5O12, by properly choosing the atomic ratio (Y/Fe=3.5) in the reaction solution. The magnetization of the films at room temperature is 10–40 emu/cc, several times smaller than that observed for crystalline YIG. It exhibited, however, a paramagnetic Mössbauer spectrum at room temperature, suggesting that the weak magnetization is ascribed to the magnetic impurity phase whose concentration is too small to be discerned by x-ray diffraction and Mössbauer measurements. The spectrum has an isomer shift of 0.22 mm/sec at 300 K and a hyperfine field splitting of 462 kOe at 12 K, indicating that the Fe ions are in a trivalent high spin state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355471
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Local structure of porous silicon (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5171-5178 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Local structural information has been obtained from extended x-ray-absorption fine-structure measurements on samples of porous silicon produced under various conditions, and these have been correlated with photoluminescence emission and excitation spectra. The x-ray near-edge structure (XANES) shows the existence of a feature in between those assigned to Si—Si and Si—O bonding. Laser-induced mass analysis indicates that the presence of various silicon hydroxides correlates strongly with the strength of this peak. In addition, although porous silicon consists of a surface whose roughness is of the order of nm, it has been possible to obtain depth-profiling reflected x-ray-absorption fine structure (REFLEXAFS) and reflectivity from some samples. The REFLEXAFS XANES again shows the additional feature, the strength of which increases with the intensity of the Si-Si peak, that is, with depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357234
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamic modeling of piezoceramic polymer composite with 2-2 connectivity (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6014-6016 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A dynamic theory on the piezoceramic polymer composite with 2-2 connectivity is presented. By adopting an approach similar to the Lamb waves in a plate, the distributions of the elastic and electric fields in a piezocomposite are solved and the dispersion curves are obtained. Based on these results, a method is developed to evaluate the sound velocity, acoustic impedance, and electromechanical coupling factor kt in a composite. The theoretical predictions are in excellent agreement with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358354
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetite coating prepared by ferrite plating on expanded polytetrafluoroethylene membrane for medical use : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 7171-7173 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As the first step to the study of increasing biocompatibility of expanded polytetrafluoroethylene (EPTFE) membranes, cardiovascular patches of EPTFE substrates were coated with Fe3O4 layer, which is expected to accelerate proliferation of endothelial cells. The ferrite layers were formed by the thin liquid film ferrite plating method at T=75–90 °C and pH (in oxidizing solution)=6.9–7.4. At a fixed pH value, a single-phase Fe3O4 layer is obtained when T is higher than a threshold temperature, which increases with an increasing pH value; below the threshold temperature, the layer has an impurity phase of γ-FeOOH. The obtained Fe3O4 layers are polycrystalline with no preferred orientation, having magnetization and coercive force which agree with those reported for bulk samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356684
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  • 5
    Electronic Resource
    Electronic Resource
    Direct evaluation of domain-wall and intrinsic contributions to the dielectric and piezoelectric response and their temperature dependence on lead zirconate-titanate ceramics (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 454-459 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By making use of the fact that domain-wall motions do not produce volumetric changes, an experimental method is introduced to directly and quantitatively determine the domain-wall and intrinsic contributions to the piezoelectric and dielectric responses of a ferroelectric material. Utilizing this method, the contributions from the domain walls and intrinsic part as well as their temperature dependence for lead zirconate-titanate (PZT) 52/48 and PZT-500 ceramics are evaluated. The data show that at temperatures below 300 K, the large change in the dielectric and piezoelectric constants with temperature is due to the change in the domain-wall activities in the materials. The results confirm that most of the dielectric and piezoelectric responses at room temperature for the materials studied is from the domain-wall contributions. The data also indicate that in PZT-500, both 180° wall and non-180° walls are possibly active under a weak external driving field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355874
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    Paper (German National Licenses)
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