What is it about?

Piezoelectrics form the alarms in our watches, the warning buzzers in our cars, and the transducers used in sonar and medical ultrasound imaging. These applications are based on the property that piezoelectric crystal deforms under the application of an electric field. For example, X-cut quartz show 2.4 pm deformation at 1 V application. How to measure this extremely small deformation is of critical importance either from the view point of industry applications or from the view point of fundamental researches. In this paper, a low-cost measurement system has been shown to be able to accurately determine the deformation of piezoelectric by using a very simple capacitor sensor.

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Why is it important?

The measurement system can determine not only pm-order displacement precisely but also the large displacement within the range of +25 μm with a sub-nanometer resolution. The system can also be used to measure the variation in strain within the temperature range of 210–450 K, allowing the evaluation of the temperature dependence of a piezoelectric constant and the studies on the effects of a phase transition on the piezoelectric response.

Perspectives

As commented by the reviewer, “This method can potentially be a measuring standard for the piezoelectric constant via converse piezoelectric effect”. Also it can help us to understand how the crystal structure change influences on the piezoelectric effects, which might provide essential information for designing novel piezoelectric materials.

Desheng Fu
Shizuoka Daigaku

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This page is a summary of: A capacitive displacement system for studying the piezoelectric strain and its temperature variation, Journal of Applied Physics, April 2021, American Institute of Physics, DOI: 10.1063/5.0040541.
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