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  • 2000-2004  (2)
  • 2001  (2)
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  • 2000-2004  (2)
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  • 1
    Digitale Medien
    Digitale Medien
    90° domain reorientation and domain wall rearrangement in lead zirconate titanate ceramics characterized by transient current and hysteresis loop measurements (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5093-5099 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The polarization switching in Pb(Zr,Ti)O3 (PZT) ferroelectric bulk ceramics undoped and doped with Nb2O5 or Fe2O3 was studied by means of both hysteresis loops and transient current measurements at room temperature. The results obtained revealed that in PZT ceramics, during the poling process, the reorientation of the polarization may be interpreted as resulting of two contributions: two 90° domain reorientation followed by 90° domain wall rearrangement. 90° domain reorientation is field dependent and responsible for a shoulder observed in the transient current curves, while domain walls contribution is nearly field independent and occurs for longer time. 90° domain wall rearrangement enabled an increase of about 40% of the total polarization in the samples. The reorientation behavior of the domains showed to be strongly influenced by the type of impurity and by the electrical field strength. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1333742
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  • 2
    Digitale Medien
    Digitale Medien
    Field-induced sharp ferroelectric phase transition in Sr0.66Ba0.34Nb2O6 relaxor ferroelectric (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2800-2802 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Field-induced sharp ferroelectric phase transition was observed in Sr0.66Ba0.34Nb2O6 single crystals. The peaks of the real and imaginary parts of dielectric permittivity arise upon cooling under weak dc bias electric fields and subsequently heating under zero fields or upon cooling under zero fields and subsequently heating under weak electric fields. The applied electric field cancels the random fields that destroy the phase transition and give rise to low temperature domain state if E=0. These results strongly suggest that the SBN system belongs to the random field Ising universality class, a rare case among structural phase transitions. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1413727
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