Abstract
The fatigue of lead titanate and lead zirconate titanate ferroelectric thin films, i.e., a change in the polarization as a function of the number of switching cycles in an external electric field, is investigated experimentally. The threshold numbers of switching cycles are determined to be 1010–1011 for the lead titanate films and 109–1010 for the lead zirconate titanate films. It is shown that a change in the temperature does not substantially affect the threshold number of switching cycles at which the switched polarization decreases drastically. However, an increase in the external field strength leads to a noticeable decrease in the threshold number of switching cycles. The process of fatigue is accompanied by an increase in the coercive field and the internal bias field. It is established that, as the number of switching cycles increases, the internal bias field changes more significantly as compared to the coercive field. The absence of a change in the phase composition in repeatedly switched samples indicates that the fatigue processes have a nonchemical nature. The anomaly observed in the frequency dependence of the permittivity in the frequency range 106–107 Hz due to the domain structure disappears after multiple switching cycles. This suggests that the observed fatigue phenomenon has a domain nature.
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Original Russian Text © A.S. Sidorkin, L.P. Nesterenko, A.L. Smirnov, G.L. Smirnov, S.V. Ryabtsev, A.A. Sidorkin, 2008, published in Fizika Tverdogo Tela, 2008, Vol. 50, No. 11, pp. 2066–2072.
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Sidorkin, A.S., Nesterenko, L.P., Smirnov, A.L. et al. Fatigue of lead titanate and lead zirconate titanate thin films. Phys. Solid State 50, 2157–2163 (2008). https://doi.org/10.1134/S1063783408110255
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DOI: https://doi.org/10.1134/S1063783408110255