Browsing by Author "Pojprapai, S"

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    Ferroelastic domain switching fatigue in lead zirconate titanate ceramics
    (Elsevier, 2008-04) Pojprapai, S; Jones, JL; Studer, AJ; Russell, J; Valanoor, N; Hoffman, M
    The influence of the frequency and amplitude of cyclic mechanical loading on soft, tetragonal lead zirconate titanate (PZT) ceramics was investigated via neutron diffraction. Intensity change in the {2 0 0} reflections provided quantitative measurements of domain switching behavior, domain texture and the strain resulting from domain switching. The results are explained using a viscoelasticity model. It was found that the magnitude of applied stress affects the level of strain accumulated, while its frequency affects the time taken for the strain to reach saturation. Furthermore, markedly different behaviors are exhibited by poled and unpoled samples. For samples loaded under identical conditions, the frequency effect is more pronounced in unpoled samples and the accumulated ferroelastic strain is greater in poled samples. © 2008, Elsevier Ltd.
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    Temperature dependence on domain switching behavior in lead zirconate titanate under electrical load via in situ neutron diffraction
    (Wiley-Blackwell, 2011-10-01) Pojprapai, S; Simons, H; Studer, AJ; Luo, ZH; Hoffman, M
    The influence of temperature on the kinetics of domain switching in lead zirconate titanate was investigated by using in situ neutron diffraction. Samples were electrically loaded to 1 kV/mm at 30°C, 125°C, and 175°C, after which the diffracted patterns in the on- and off-state were compared. The results demonstrated that the degree of domain switching increases with increased temperature. Corroboration with hysteresis measurements showed that while the coercive field decreases with increasing temperature, the degree of saturation increased significantly. According to Merz's model, it is therefore apparent that, due to increased switching rate at high temperature, domain switchability increases with temperature. © 2011, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com