Low-frequency dielectric response of polyethylene terephthalate (PET) films

Miyairi, Keiichi

doi:10.1088/0022-3727/19/10/023

Cited by 26 publications

(21 citation statements)

References 6 publications

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“…8. Space charge polarization was observed in the neat PET at LF/HT, which has been characterized as the "ρ" peak by previous researchers following an Arrhenius behavior with an activation energy in the range of 1.0-1.5 eV and relaxation frequency of 0.1 Hz around 180°C [26]. High dielectric losses at this "ρ" peak are attributed to the drift of charge carriers between the electrodes under the applied electric field and the high values of to space-charge polarization.…”

Section: B Dielectric Propertiesmentioning

confidence: 84%

Dielectric Response of Tantalum Oxide Deposited on Polyethylene Terephthalate (PET) Film by Low-Temperature Pulsed-DC Sputtering for Wound Capacitors

Sethi

Sahul

Min

et al. 2009

IEEE Trans. Comp. Packag. Technol.

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Deposition of high-k tantalum oxide thin films on thin polymer substrates was investigated, using lowtemperature (−100°C) pulsed-dc reactive sputtering. Degradation of two different polymers, polyethylene terephthalate (PET) and polypropylene (PP), were studied as a function of sputtering conditions. Two different deposition configurations have been explored for polymer films with aluminum electrode on one side. In one configuration, tantalum oxide was deposited on the nonelectroded side of the polymer, while in the other the deposition was on the electroded side of the polymer. The two fabricated structures have been characterized for dielectric permittivity, loss, and ac conductivity as a function of frequency and temperature. Sputtering tantalum oxide on the nonelectroded side of PET substrates results in a 37% higher permittivity for PET than the series model prediction of permittivity. Higher dielectric loss and ac conductivity accompany the higher permittivity. The α bulk relaxation in PET moves to slightly higher temperatures, indicating that there is an increase in the crystallinity of the bulk polymer. This observation is supported by the broader glass transition and an additional endothermic peak around 200°C in PET/Ta 2 O 5 compared to neat PET. In addition, modifications of the space charge activation energy in PET from 1.35 eV to 1.82 eV and of dc conductivity in PET from 6×10 −15 S/m to 4×10 −14 S/m is observed. Sputtering Ta 2 O 5 on the electroded side of the PET, under the same sputtering conditions, results in the formation of high-k tantalum oxide with dielectric permittivity,

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Section: B Dielectric Propertiesmentioning

confidence: 84%

Dielectric Response of Tantalum Oxide Deposited on Polyethylene Terephthalate (PET) Film by Low-Temperature Pulsed-DC Sputtering for Wound Capacitors

Sethi

Sahul

Min

et al. 2009

IEEE Trans. Comp. Packag. Technol.

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“…From a theoretical point of view, at low fields and in a broadband frequency and/or a wide temperature range of investigation, several dielectric processes have been identified to govern the dielectric response of polar dielectric materials [44]. Among them, the interfacial processes such as the Maxwell-Wagner-Sillars (MWS) relaxation or the EP mainly control the LF/HT dielectric response.…”

Section: Fig 1 (Color Online)mentioning

confidence: 99%

“…Figure 5 presents the temperature dependence of the mean relaxation times τ 2 (ρ-relaxation) and τ 3 (ρ * -relaxation). These two RPs exhibit an Arrhenius-like behavior following the equation: [19,21].…”

Section: Ep Behavior and DC Conductivity Extractionmentioning

confidence: 99%

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Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Diaham

Locatelli

Lebey

et al. 2009

Eur. Phys. J. Appl. Phys.

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Abstract. The characterization of the BPDA/PDA polyimide (PI) at high temperature up to 400• C, thanks to dielectric relaxation spectroscopy (DRS) in the 10 −1 Hz to 10 6 Hz frequency range, allows the determination of the dc electrical conductivity (σ dc ). In such a high temperature range, the dielectric spectra are modified by the extrinsic electrode polarization phenomenon (EP) response. A model is proposed which coupled to the DRS results allows evidencing and quantifying the effect of the EP. The proposed method gives a simple way to determine the intrinsic σ dc values from the effective ac dielectric response, improving the accuracy and reducing the duration of measurement.

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“…This suggests that the term A/x m could be attributed to the effect of electrode polarization. [25][26][27] …”

Section: Resultsmentioning

confidence: 99%

Impedance Spectroscopy of Nanofluids based on Multiwall Carbon Nanotubes

Tagmouti

Bouzit

Costa

et al. 2015

Spectroscopy Letters

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This work is a contribution to the understanding of the dielectric properties of nanofluids prepared by dispersing multiwalled carbon nanotubes in transformer oil. The dielectric measurements were carried out in the frequency range 100 Hz-1 MHz at constant temperature, T ¼ 300 K, for several volume fractions of the nanotubes in the base fluid. A relaxation phenomenon was induced in the nanofluid comparing to the base fluid. In addition, both the real and imaginary part of the dielectric permittivity changed with volume fraction of the nanotubes. These results suggest that the presence of the nanotubes greatly affect the dielectric properties of the oil as a result of polarization phenomenon induced by these nanoparticles.It was found that the measured effective dielectric permittivity follows the empirical Havriliak-Negami model. Nevertheless to take into account the electrode polarization effects, we rewrote this model, with a new term, which fits accurately the experimental data.

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Low-frequency dielectric response of polyethylene terephthalate (PET) films

Cited by 26 publications

References 6 publications

Dielectric Response of Tantalum Oxide Deposited on Polyethylene Terephthalate (PET) Film by Low-Temperature Pulsed-DC Sputtering for Wound Capacitors

Dielectric Response of Tantalum Oxide Deposited on Polyethylene Terephthalate (PET) Film by Low-Temperature Pulsed-DC Sputtering for Wound Capacitors

Dielectric measurements in large frequency and temperature ranges of an aromatic polymer

Impedance Spectroscopy of Nanofluids based on Multiwall Carbon Nanotubes

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