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Measurement of the pyroelectric coefficient of poly,,vinylidene fluoride... down to 3 K R. W. Newsome, Jr. and E. Y. Andrei
 

Summary: Measurement of the pyroelectric coefficient of poly,,vinylidene fluoride... down to 3 K
R. W. Newsome, Jr. and E. Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855
Received 6 September 1996; revised manuscript received 22 November 1996
The temperature dependence of the pyroelectric coefficient p of polyvinylidene fluoride (PVF2) was mea-
sured from 307 K to the previously unexplored region of 3 K. The measurements were performed on a film of
oriented ( -phase PVF2 by monitoring its surface charge response to quasistatic heating and cooling tran-
sients. The data exhibit a pure cubic temperature dependence from 3 to 6 K with no evidence of a linear term.
This is consistent with the prediction by Szigeti and the Debye limit, respectively, for the primary i.e.,
strain-free and secondary contributions to pyroelectricity. The data from 20 to 150 K, which include the
region of largest change, are well fit by an exponential function i.e., a0e /T
), corresponding to a thermal
activation energy of (25.9 0.06) K. Our data for p , from 100 to 250 K, are approximately proportional
to the thermal expansion coefficient, recently published by Hartwig, which indicates that the observed pyro-
electricity is dominated by piezoelectric i.e., secondary contributions in that temperature regime.
S0163-1829 97 08211-8
I. INTRODUCTION
A. Overview
Most studies of the pyroelectric coefficient of polyvi-
nylidene fluoride i.e., PVF2 or PVDF have focused on the

  

Source: Andrei, Eva Y. - Department of Physics and Astronomy, Rutgers University

 

Collections: Materials Science; Physics