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PZT switching polarity at high voltages

Discussion in 'Sensors and Actuators' started by loz88888888, May 19, 2021.

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  1. loz88888888

    loz88888888

    3
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    Feb 23, 2021
    Can someone please help me understand why my piezoelectric actuator switches polarity at a certain voltage? The below is just positive voltage applied across it, but ~50V it starts to deflect downwards instead of upwards. I understand that this is related to the coercive field and this is a soft PZT so expect some instability in the domain walls, but i was surprised this was happening at such a low applied voltage. Any help in understanding and/or a way to calculate the max voltage before polarity switching based on size/thickness of the piezo? The below shows um deflection on the y axis, at the labelled voltages.
    Thanks!

    upload_2021-5-18_20-14-54.png
     

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