Influence of gas pressure in the voids during charging on the piezoelectricity of ferroelectrets

Xunlin Qiu, Axel Mellinger, Reimund Gerhard

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Cellular polypropylene ferroelectrets were subjected to vacuum and high air pressures. The capacitance of the samples was measured as a way to monitor their thickness. It was found that both in vacuum and in high-pressure air, the thickness of the samples recovers to its original value after a sufficient storage time (typically, several hours), indicating that the internal and external pressures equalize as a result of gas diffusion. Optimal piezoelectricity is achieved by charging at a pressure of 170 kPa, which is explained by means of the void-height distribution function in combination with Townsend's model of the Paschen breakdown.

Original languageEnglish
Article number052901
JournalApplied Physics Letters
Volume92
Issue number5
DOIs
StatePublished - 2008

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