Resistivity Estimates for Some Shocked Ferroelectrics

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Abstract
It has been observed previously that the shape of the current pulse delivered to an external short circuit by a shock‐loaded ferroelectric ceramic specimen undergoes an abrupt change when a sufficiently high shock stress level is reached. This change was explained qualitatively as being due to the onset of electrical conduction in the specimen. Here a quantitative analysis of short‐circuit current waveshapes from some typical ferroelectric materials is made on the basis of a previously developed model that has been extended to include the effect of conduction. Finite resistivity is assumed in the stressed region of a specimen and evaluated in terms of the various model parameters and experimental quantities, particularly the short‐circuit current itself. With the analysis an estimate is made that the resistivity of the ferroelectric materials under shock stress in the range of 25 to 35 kbar is of the order of a 100 Ω·cm with accompanying fields greater than about 20 000 V/cm.

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