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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5093-5099 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 2112-2117 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The domain reorientation process in polycrystalline materials was investigated through hysteresis loop measurements in soft and hard lead zirconate titanate (PZT) bulk ceramics. In order to investigate the degree of alignment of domains with the electric field the ferroelectric characterizations were performed in two perpendicular directions for each sample. It was found that for the soft PZT, the kinetics of the fatigue process due to space charges in a specific direction is not affected by the previous fatigue story induced in the other perpendicular one thus showing a fatigue anisotropy. This fact was attributed to no displacement of part of space charges during the electric field switching. However, for the hard PZT, an influence of the previous electric story could be observed due to the continuous realignment of the complex defects perpendicularly to the electric field. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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