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  • 2000-2004  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Second-harmonic generation study of domain walls in xBi2Ti4O11-(1−x)Bi4Ti3O12 films with large dielectric permittivity (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 3172-3177 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Phase-sensitive second-harmonic generation (SHG) is employed to investigate domain patterns of c-axis oriented xBi2Ti4O11-(1−x)Bi4Ti3O12 films on SrTiO3 (001) substrates. The film density increases with increasing Bi2Ti4O11 concentration up to x=0.39. No SHG signal was observed on the Bi2Ti4O11 film. Double peaks appear in the curves of the dependence of the SHG signal on the fundamental polarization (0°–180°), which suggests the net polarization of Bi4Ti3O12 domains oriented along SrTiO3 [110] and [11¯0] directions. Under transverse electric field poling along the SrTiO3 [100] direction, the films with x=0.06 and 0.12 behave differently. The double peak intensities both increase monotonically with increasing ±E fields in the film with x=0.06. However, they change reversibly for the film at x=0.12 with increasing voltage from −2.0 to +2.1 kV. Theoretical modeling suggests the possibility of 180° wall motion with an uncorrelated phase relation for the film with x=0.06, but 90° wall motion with a complete phase relation for the film with x=0.16. The large dielectric permittivity for the film with x=0.39 is assumed to come from the 90° wall motion. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1445497
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency-induced structure variation in electrorheological fluids (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3821-3823 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We show that by changing the frequency of the externally applied electric field there can be significant variation in the column structure of the electrorheological (ER) fluids, with attendant yield stress implications. This phenomenon is quantitatively explained by the Debye-type relaxation associated with ER fluids' solid particles. First-principle predictions based on the Debye-type dielectric constant are in excellent agreement with the experiments. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329860
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    Paper (German National Licenses)
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