Pressure Dependence of Ferroelectric Transition and Anomaly in Bulk Modulus in Copolymer of Vinylidende Fluoride and Trifluoroethylene

概要

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Thermal expansion of copolymer of 52.8 mol-% vinylidene fluoride and 47.2 mol-% trifluoroethylene under varied hydrostratic pressure p up to 100 MPa was observed over a temperature range of 30 to 110℃. Pressure dependence of the ferroelectric transition T_t was evaluated as 0.318 K MPa^<-1> from the abrupt change in thermal expansion at the transition. This considerably large value of dT_t/dp was in good agreement with that found in the dielectric measurements. The bulk modulus vs temperature curve exhibited a conspicuous minimum at the transition of 337 K as is the case with ferroelectric crystals.
社団法人応用物理学会の論文
1984-05-20