Modified Sawyer and Tower circuit for the investigation of ferroelectric samples

Sinha, J. K.

doi:10.1088/0950-7671/42/9/308

Cited by 81 publications

(24 citation statements)

References 3 publications

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“…The discharged energy density was measured by the modified Sawyer-Tower circuit 29 . In the fast discharge experiment, the polymer film capacitor was charged to a given field E and through a high-voltage MOSFET switch (Behlke HTS81), the stored energy was discharged to a resistor R L as schematically shown in inset of Fig.…”

Section: Methodsmentioning

confidence: 99%

Ferroelectric polymer networks with high energy density and improved discharged efficiency for dielectric energy storage

et al. 2013

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Ferroelectric polymers are being actively explored as dielectric materials for electrical energy storage applications. However, their high dielectric constants and outstanding energy densities are accompanied by large dielectric loss due to ferroelectric hysteresis and electrical conduction, resulting in poor charge-discharge efficiencies under high electric fields. To address this long-standing problem, here we report the ferroelectric polymer networks exhibiting significantly reduced dielectric loss, superior polarization and greatly improved breakdown strength and reliability, while maintaining their fast discharge capability at a rate of microseconds. These concurrent improvements lead to unprecedented charge-discharge efficiencies and large values of the discharged energy density and also enable the operation of the ferroelectric polymers at elevated temperatures, which clearly outperforms the melt-extruded ferroelectric polymer films that represents the state of the art in dielectric polymers. The simplicity and scalability of the described method further suggest their potential for high energy density capacitors.

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Section: Methodsmentioning

confidence: 99%

Ferroelectric polymer networks with high energy density and improved discharged efficiency for dielectric energy storage

et al. 2013

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“…Dielectric properties were characterized at different frequencies and temperatures using an HP (4284A) LCR meter equipped with a computer controlled temperature chamber. The electric-displacement (D)-electric field (E) curves were characterized at 10 Hz using a Sawyer-Tower circuit from which the discharged energy density was determined [10]. The discharged energy density was also measured by directly discharging the stored electric energy to a resistor load R L .…”

Section: Methodsmentioning

confidence: 99%

Electrical Energy Density and Discharge Characteristics of a Poly(vinylidene fluoride-chlorotrifluoroethylene)Copolymer

Zhou

Chu

Neese

et al. 2007

IEEE Trans. Dielect. Electr. Insul.

222

117

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The high electric displacement (D>0.1 C/m 2 ) and breakdown field (>600 MV/m) in polyvinylidene fluoride based polymers suggest high electrical energy density in this class of polymers. By defect modifications which reduce or eliminate the remnant polarization in the polymer, a high electrical energy density can indeed be obtained. This paper shows that in properly prepared P(VDF-CTFE) copolymer film capacitors, an electrical energy density ~ 25 J/cm 3 can be obtained with a breakdown field higher than 600 MV/m. The dielectric and discharge behavior of the polymer films were investigated. The results reveal that there are strong frequency dispersions in both the dielectric and discharge behavior. The dielectric constant decreases with frequency and the discharged energy density is also reduced at shorted discharge time (~ 1 μs) due to increased ESR for fast discharge. The results indicate the potential of this class of polymers for high energy density capacitors and suggest the need for further tuning of the polymer compositions to reduce the frequency dispersion.

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“…The polymer films are annealed at 180 C for 6 h then cooled to room temperature before peeled off from the substrate. The energy density storage and loss of dielectric materials could be calculated from the D-E loop measured by the traditional Sawyer-Tower circuit [15] under a unipolar electric field as shown in Fig. 2.…”

Section: Characterizationmentioning

confidence: 99%

Energy storage study of ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymers

Zhang

Meng

Chung

2009

Polymer

134

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Modified Sawyer and Tower circuit for the investigation of ferroelectric samples

Cited by 81 publications

References 3 publications

Ferroelectric polymer networks with high energy density and improved discharged efficiency for dielectric energy storage

Ferroelectric polymer networks with high energy density and improved discharged efficiency for dielectric energy storage

Electrical Energy Density and Discharge Characteristics of a Poly(vinylidene fluoride-chlorotrifluoroethylene)Copolymer

Energy storage study of ferroelectric poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) terpolymers

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