铁电性
结晶度
电介质
材料科学
辐照
极化(电化学)
朗缪尔-布洛杰特电影
共聚物
相变
介电常数
氟化物
铁电聚合物
热电性
凝聚态物理
聚合物
单层
物理化学
化学
无机化学
复合材料
纳米技术
光电子学
物理
核物理学
作者
Christina M. Othon,F. B. Bateman,Stephen Ducharme
摘要
The effect of irradiation on the ferroelectric properties of Langmuir-Blodgett films of the copolymer poly(vinylidene fluoride-trifluoroethylene) was investigated using 1-MeV electrons for doses from 0.16to1.10MGy, where 1Gray(Gy)=100rad. Irradiation causes a systematic decrease in the phase-transition temperature, crystallinity, and spontaneous polarization of the films. The crystallinity and spontaneous polarization of the films decreased by amounts proportional to the dose, both tending toward zero near a dose of 1.30MGy. The ferroelectric-paraelectric phase-transition temperature, however, was only reduced by about 12%, indicating that the primary effect of irradiation was to convert a crystalline ferroelectric material to a noncrystalline dielectric.
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