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Low-temperature specific heat measurement of a ferroelectric copolymer film of vinylidene fluoride and trifluoroethylene
 

Summary: Low-temperature specific heat measurement of a ferroelectric copolymer film
of vinylidene fluoride and trifluoroethylene
R. W. Newsome, Jr. and E. Y. Andrei
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855, USA
Received 5 June 2003; revised manuscript received 8 September 2003; published 13 February 2004
The specific heat of a highly crystallized ferroelectric copolymer film of vinylidene fluoride ( 80 mol%)
and trifluoroethylene ( 20 mol%) was measured over the previously unexplored temperature range from 3.7
to 8.5 K. The data show a dominant cubic temperature dependence, with only marginal evidence for a T3/2
or
a T2
component. There is also no evidence for the discontinuity in slope that was observed in previous
measurements of the pyroelectric coefficient of this material in the vicinity of 6 K. This difference is consistent
with the supposition that thermal expansion is the dominant contributor to the pyroelectric coefficient in this
temperature range. The specific heat data also show a rapid transition from the three-dimensional to one-
dimensional Debye limits.
DOI: 10.1103/PhysRevB.69.064105 PACS number s : 77.70. a, 65.60. a, 77.84.Lf, 77.84.Jd
I. Introduction
Prior measurements of the specific heat of the copolymer
of vinylidene fluoride and trifluoroethylene VDF-TrFE do
not extend below 18 K.1

  

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

 

Collections: Materials Science; Physics