Pyroelectric Coefficient and Heat Capacity of a Ferroelectric Copolymer of Vinylidene Fluoride and Trifluoroethylene at Low Temperature

概要

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The temperature dependence of the static pyroelectric coefficient p and dynamic pyroelectric response voltage V_s of a highly crystallized ferroelectric copolymer of vinylidene fluoride (75 mol%) and trifluoroethylene (25 mol%) is measured in the temperature range of 10-300 K. The observed p and the heat capacity C_p derived from p/V_s both decrease with decreasing temperature, tending toward zero in the vicinity of 0 K. The temperature dependence of C_p is fitted to the capacity contributed from three- and one-dimensional acoustical modes of vibrations with Debye temperatures of 52 K and 460 K, respectively, and contributed from main optical vibrations. It is found that the one-dimensional acoustical vibrations and optical vibrations with an average frequency of about 290 cm^<-1> dominantly contribute to the primary pyroelectric coefficient p_l.
社団法人応用物理学会の論文
1992-08-15