Investigation of the electrophysical properties of ferroelectrics under conditions of shock-wave loading. I. Methods of investigation

Novitskii, E. Z.; Sadunov, V. D.; Trishchenko, T. V.

doi:10.1007/bf00756249

Cited by 2 publications

(3 citation statements)

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“…In this method, along with the piecewise-constant control σ h (t) (0 t T ), which is an approximation to the normal solution σ * of problem (6), an auxiliary piecewise-linear function z h (t) (0 t T ) is constructed, which helps follow the observed trajectory…”

Section: Siec Measurement Methodsmentioning

confidence: 99%

“…The guide is constructed using the analog of the difference Eulerian method for the solution of the Cauchy problem (6), which differs from the classical Eulerian method in that in (9) the functions appearing in the initial differential equation are calculated at the point V =Ṽ i instead of V = z h (t i ). The role of the guide is to follow the substantial trajectory numerically by the observed values ofṼ i (i = 0, N − 1) by means of the best [in the sense of (7) and (8)…”

Section: Siec Measurement Methodsmentioning

confidence: 99%

“…However, because of the lack of experimental data on SIEC, this quantity was not taken into account quantitatively in phenomenological and computational models for the electrical response of the abovementioned devices to SW action [2,4,5]. There has been an attempt to measure SIEC in piezoceramics using the voltmeter-ammeter method and the oscillating circuit method [6]. Generally, however, measurements can be performed on unpolarized material samples or 1 Institute of Experimental Physics Russian Federal Nuclear Center, Sarov 607190; root@gdd.vniief.ru.…”

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confidence: 99%

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Measuring shock-induced electrical conductivity in piezoelectrics and ferroelectrics. Single-crystal quartz

Borisenok

Kruchinin

Bragunets

et al. 2007

Combust Explos Shock Waves

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A method is proposed to measure shock-induced electrical conductivity in electrically active dielectrics -piezoelectrics and ferroelectrics. Results of measurements of electrical conductivity in single-crystal quartz are reported.An analysis of the literature [1] shows that the overwhelming majority of experimental data on the shockinduced electrical conductivity of materials were obtained by electrocontact methods of measuring electrical resistance. All of them are based on the application of an electrical voltage to the material sample studied or on the passage of an electric current from an external source through the sample [1]. These methods, however, are unsuitable for measuring shock-induced electrical conductivity (SIEC) in piezoelectrics and ferroelectrics because shock-wave (SW) action generates an electric field of strength up to 10 7 -10 8 V/m [2] in these materials due to the piezoeffect or shock depolarization, and the effect in question can hardly be identified against the background of the generated fields.SIEC is an important characteristic in the use of piezoelectrics and ferroelectrics as a working medium of dynamic pressure transducers [2] and explosive piezogenerators [3]. However, because of the lack of experimental data on SIEC, this quantity was not taken into account quantitatively in phenomenological and computational models for the electrical response of the abovementioned devices to SW action [2,4,5]. There has been an attempt to measure SIEC in piezoceramics using the voltmeter-ammeter method and the oscillating circuit method [6]. Generally, however, measurements can be performed on unpolarized material samples or the time when depolarization processes in a material have been completed. Therefore, they have a limited range region of application.In the present study, we propose a method for measuring SIEC in piezoelectrics and ferroelectrics which is based on the use of the electric field generated in the material under SW action. A similar approach was employed in [7] to develop a procedure for measuring radiation-induced electrical conductivity in pyroelectrics. SIEC MEASUREMENT METHODLet us derive a differential equation that describes the electrical response of a piezoelectric or ferroelectric sample to SW action taking into account shock-induced electrical conductivity. A schematic representation of the sample is given in Fig. 1.The sample in the shape of a rectangular parallelepiped with dimensions x 0 × y 0 × z 0 is placed in a dielectric medium. Thin metal electrodes are applied on its faces parallel to the plane Y Z. A load resistance R load is switched between the electrodes. A plane SW prorogates at a velocity D along the Z axis.The SW front divides the sample into a compressed and an uncompressed zones. Leakage of the generated electric charge can occur on the face of the sample parallel to the coordinate plane XY (the corresponding surface electrical conductivity is σ 1 ), on the faces par-96 0010-5082/07/4301-0096

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Section: Siec Measurement Methodsmentioning

confidence: 99%

Section: Siec Measurement Methodsmentioning

confidence: 99%