Reversible pyroelectricity and inverse piezoelectricity in polyvinylidene fluoride
Reversible pyroelectricity and inverse piezoelectricity in polyvinylidene fluoride
复制标题
DOI：
10.1063/1.1663785
复制
发表时间：
1974-08
影响因子：
3.2
通讯作者：
H. Burkard;G. Pfister
中科院分区：
文献类型：
--
作者：
H. Burkard;G. Pfister
我们对商用聚偏二氟乙烯薄膜在 170–350 °K 温度范围内的可逆热释电效应和 0.3 °K 温度下的逆压电效应进行了直流测量，这些薄膜在高温下的强直流电场中极化。热电系数 dP/dT 随着温度的增加而增加，并且在 Tg≃−50 °C 和 Tb≃+20 °C 时表现出轻微的不连续斜率变化。在室温下，dP/dT ∼4×10−10 C/cm2 °K。在 0.3 °K 时，沿样品厚度测量的压电应变系数 d33 约为 -10−8 cgs，其中负号表示在极化场方向施加直流场时薄膜厚度会减小。平面 d31 中的应变系数约为 10−9 cgs。退火实验表明可逆热释电效应和逆压电效应源于相同的极化。
We present dc measurements of the reversible pyroelectric effect in the temperature interval 170–350 °K and of the inverse piezoelectric effect at 0.3 °K for films of commercial polyvinylidene fluoride which were polarized in a strong dc electric field at elevated temperatures. The pyroelectric coefficient dP/dT increases with temperature and exhibits slightly discontinuous changes in slope at Tg≃−50 °C and Tb≃+20 °C. At room temperature, dP/dT ∼4×10−10 C/cm2 °K. At 0.3 °K the piezolectric strain coefficient d33 measured along the thickness of the sample is of the order of −10−8 cgs, where the negative sign indicates that the film thickness decreases upon application of a dc field in the direction of the poling field. The strain coefficients in the plane, d31, are of the order of 10−9 cgs. Annealing experiments suggest that the reversible pyroelectric effect and the inverse piezoelectric effect originate from the same polarization.