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. 2017 Oct 10;7:12915. doi: 10.1038/s41598-017-13425-w

Figure 7.

Figure 7

Piezoelectric displacement and large-signal d33 value of 4-µm-thick PZT film as a function of working cycles, defined from the unipolar D-E loops measured at 200 kV/cm and 10 Hz. The fatigue testing was performed by applying a bipolar triangular field of 100 kV/cm and at 100 kHz.