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. 2014 May 27;4:5075. doi: 10.1038/srep05075

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a) The normalized polarization as a function of the cumulative number of cycles. The amplitude was fixed at 40 V and the frequency was varied from 10 Hz to 100 kHz. At high frequency polarization switching is impeded and therefore the capacitor is fatigue-free. The onset of the degradation is at about 10⁴ cycles. b) Replotted data of normalized polarization as a function of the cumulative time.