Observation of charge compensated polarization zones in polyvinylidenefluoride (PVDF) by piezoelectrically generated pressure step wave (PPS) response

Eisenmenger, Wolfgang; Haardt, M.; Holdik, K.

doi:10.1109/ceidp.1982.7726512

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…To induce ferroelectric orientation of dipoles in a crystalline phase of polymers they are subjected to a poling procedure. The thermoelectret technique was typical for early experiments [6][7][8], but has been gradually replaced by poling in a corona [9][10][11][12][13][14][15][16][17]. It has been claimed that a homogeneous and stable polarization can be obtained by the cycling hysteresis method [18,19], but in many cases residual polarization appeared to be distributed nonuniformly in the thickness direction of the samples [6][7][8][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

“…The thermoelectret technique was typical for early experiments [6][7][8], but has been gradually replaced by poling in a corona [9][10][11][12][13][14][15][16][17]. It has been claimed that a homogeneous and stable polarization can be obtained by the cycling hysteresis method [18,19], but in many cases residual polarization appeared to be distributed nonuniformly in the thickness direction of the samples [6][7][8][13][14][15][16][17]. In spite of its obvious importance, § Present address and to whom correspondence should be addressed: Prof. Dr S N Fedosov Grupo de Polímeros, Instituto de Fisica de São Carlos, Universidade de São Paulo, C P 369 CEP 13560-970 São Carlos -SP, Brazil.…”

Section: Introductionmentioning

confidence: 99%

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Polarization profiles in corona poled P(VDF-TFE) copolymer studied by piezoelectrically induced pressure step method

Fedosov¹,

Sergeeva²,

Eberle

et al. 1996

J. Phys. D: Appl. Phys.

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Polarization profiles have been measured with a resolution of about in corona poled 95:5 P(VDF-TFE) copolymer by using the piezoelectrically induced pressure step (PPS) method. A polarization peak is observed near the positive side of samples poled in a negative corona by the constant current technique. The distribution of polarization is also nonuniform in the case of a constant voltage poling at , but profiles are rather uniform if a poling field is applied at . In multilayer samples, the upper film bombarded by corona ions remains absolutely nonpolarized. Thin transition nonpolarized zones are seen near surfaces of even well polarized P(VDF-TFE). It is shown that polarization uniformity in P(VDF-TFE) is strongly affected by injection of negative charge carriers from the virtual electrode formed either on the surface bombarded by corona ions, or between two contacting dielectric surfaces. Our data on P(VDF-TFE) are in accord with those reported on other ferroelectric polymers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polarization profiles in corona poled P(VDF-TFE) copolymer studied by piezoelectrically induced pressure step method

Fedosov¹,

Sergeeva²,

Eberle

et al. 1996

J. Phys. D: Appl. Phys.

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“…With lower field strength « 1 MV fcm) spatially inhomogeneous polarization distributions are observed. This gives evidence for the influence of space charges on the formation of the remanent polarization (4).…”

Section: Polarization Distributions In Pvdf Obtained By Poling Under mentioning

confidence: 75%

“…The resulting partial differential equation can be int.egrated in space for the time stationary case ( all time derivatives vanish) if the current io is kept constant [4] .…”

Section: Discussionmentioning

confidence: 99%

“…The analytical solution gives an internal polarization zone: ( 4) !J and c include parameters concerning the model (density of traps with applied field) and the material (linear polarizability due to the pola.r crystallites, mobility of the charge carriers). The solution diverges for % -00 since no saturation of the polarization is taken into account.…”

Section: Discussionmentioning

confidence: 99%

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Polarization distribution in PVDF obtained by poling under constant current condition

Neumann

Bihler

Eberle

et al.

Annual Conference on Electrical Insulation and Dielectric Phenomena

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Since the resistivity of PVDF films increases when the films are p<>-Ied , the voltage across the samples must be increased during the poling process in order to keep the current coudaht . Under these conditions we observe the formation of a polarization zone in the center of the film depth. The thickness of the polarintion free zone dose to the film sur~ (;U;e8 is found to decrea."Ie with huger CUHent densities. The results are consistent with a model assuming charge trapping in deep traps associated with the orientation of pola.r crystallite1l.

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Space Charge

Das-Gupta

1999

Wiley Encyclopedia of Electrical and Electronics Engineering

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Observation of charge compensated polarization zones in polyvinylidenefluoride (PVDF) by piezoelectrically generated pressure step wave (PPS) response

Cited by 11 publications

References 3 publications

Polarization profiles in corona poled P(VDF-TFE) copolymer studied by piezoelectrically induced pressure step method

Polarization profiles in corona poled P(VDF-TFE) copolymer studied by piezoelectrically induced pressure step method

Polarization distribution in PVDF obtained by poling under constant current condition

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