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  • 2000-2004  (3)
  • 2002  (3)
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  • 2000-2004  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Leakage current characteristics of laser-ablated SrBi2Nb2O9 thin films (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 81 (2002), S. 880-882 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the leakage current conduction mechanism of pulsed-laser-deposited SrBi2Nb2O9 (SBN) thin films on platinized silicon substrates. The time-dependent dc leakage current densities of SBN thin films do not follow Curie–von Schweidler power law. Instead the contribution of conduction current is predominantly electronic. At lower fields, the leakage current follows the ohmic behavior, and it increases exponentially for higher fields. The leakage current density of the SBN thin films was studied at elevated temperatures, and the data were fitted with the Schottky emission model. The effective Richardson's constant was calculated to be about 8.7×10−6 A/cm2 K2. The Schottky barrier height of the SBN thin films was estimated to be 1.37 eV. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1495880
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  • 2
    Electronic Resource
    Electronic Resource
    Ferroelectric properties of laser-ablated Sr1−xAxBi2Ta2O9 thin films (where A=Ba, Ca) (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 637-639 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bismuth-layered ferroelectric thin films of Sr1−xAxBi2Ta2O9, with composition x=0 and 0.2, were fabricated by using the pulsed-laser deposition technique. Structural characterization of the films by x-ray diffraction and atomic force microscopy, revealed that the films are polycrystalline in nature with average grain size of 180 nm. The films displayed spherical grains with a surface roughness of 12 nm. The ferroelectric measurements of Sr0.8Ba0.2Bi2Ta2O9, SrBi2Ta2O9, and Sr0.8Ca0.2Bi2Ta2O9 showed saturated hysteretic behavior with remanent polarization (2Pr) of 23.5, 17.9, 14 μC/cm2 and coercive field (Ec) of 31.06, 74.2, 86.3 kV/cm for a maximum applied electric field of 360 kV/cm. Films exhibited minimal (≤17%) degradation of polarization for up to 1010 switching cycles. It was observed that the coercive field decreased with increase in the ionic size of partially substituted cations. The leakage current density of films were found to be of the order of ∼10−8 A/cm2 for up to a breakdown field of about 75 kV/cm. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1436528
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of physiological tooth movements within clinically normal periodontal tissues by means of periodontal pulsation measurements (2002)
    Oxford, UK : Munksgaard International Publishers
    Journal of periodontal research 37 (2002), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The three-dimensional physiological tooth movement synchronized with heartbeat, periodontal pulsation, has already been demonstrated by previous researchers. The purpose of this study was to estimate physiological tooth movements within clinically normal periodontal tissues, thus establishing periodontal pulsation standards. The measuring device consisted of an amorphous sensor and a small magnet, which could detect tooth displacement without coming into contact with the tooth surface. The samples consisted of the left maxillary central incisors of 23 adult subjects. Three points on the labial surface were used as reference points to measure the labial-lingual movement range, and a point on the incisal edge was used for measuring the incisal-apical movement range. Periodontal pulsation and electrocardiogram measurements were recorded simultaneously for six minutes. The results showed that the mean amplitude of periodontal pulsation concerning the labial-lingual movement range was equal at the three labial points (0.59 µm) and tended to be smaller than that of the incisal-apical movement range (0.87 µm). There were no significant differences in the mean amplitude of periodontal pulsation at any of the four reference points. Significant correlations of the amplitude of periodontal pulsation existed among the three labial points. Though most teeth pulsated uniformly to the labial direction, some teeth moved in a complex manner including rotation with an axis among the three labial points. These results suggest that the values of periodontal pulsation amplitude which were recorded employing the amorphous sensor device are reliable standards of periodontal pulsation within clinically normal periodontal tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0765.2001.00665.x
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    Paper (German National Licenses)
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