Abstract
Fused layers of polytetrafluoroethylene (PTFE) and fluoroethylenepropylene (FEP) films with small interfacial cellular gas voids show large quasistatic piezoelectric d33-coefficients of more than 1000 pC/N. After annealing at a temperature of 90 °C for 4 days, d33 amounts to about 400 pC/N and thereafter changes by less than 10 percent over a period of 5 days at this temperature. The piezoelectric coefficient is independent of applied pressure in the range up to 20 kPa. Its frequency response shows a small decrease up to the vicinity of the thickness resonance frequency at 40 to 150 kHz.
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77.65.Bn; 77.55.+f; 77.84.Jd
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Zhang, X., Hillenbrand, J. & Sessler, G. Thermally stable fluorocarbon ferroelectrets with high piezoelectric coefficient. Appl. Phys. A 84, 139–142 (2006). https://doi.org/10.1007/s00339-006-3573-5
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DOI: https://doi.org/10.1007/s00339-006-3573-5