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Applied Physics Letters / Browse Journal / Volume 92 / Issue 5 / DIELECTRICS AND FERROELECTRICITY

Appl. Phys. Lett. 92, 052901 (2008); doi:10.1063/1.2841037 (3 pages)

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

Xunlin Qiu, Axel Mellinger, and Reimund Gerhard

Applied Condensed-Matter Physics, University of Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany Map This map

(Received 21 December 2007; accepted 16 January 2008; published online 5 February 2008)

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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.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

capacitance, conducting polymers, diffusion, electrets, high-pressure effects, piezoelectricity, voids (solid)

PACS

  • 62.50.-p

    High-pressure effects in solids and liquids

  • 77.22.Ej

    Polarization and depolarization

  • 77.65.-j

    Piezoelectricity and electromechanical effects

  • 77.84.Jd

    Polymers; organic compounds

  • 72.80.Le

    Polymers; organic compounds (including organic semiconductors)

  • 61.41.+e

    Polymers, elastomers, and plastics

ARTICLE DATA

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http://link.aip.org/link/APPLAB/v92/i5/p052901/s1

PUBLICATION DATA

ISSN:

0003-6951 (print)  
1077-3118 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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