热电弛豫效应

经过人工极化的铁电陶瓷中存在的同极性和异极性电荷导致热电弛豫效应。观察到唯象理论所给出的三种类型的弛豫过程。由于同极或异极性电荷的激发需要能量,故当陶瓷的温度发生变化相当长时间之后,热释电荷按ΔQ(t)=(1+r_±e^{(-(α±t)1/2)}ΔQ_∞缓慢地衰减。曾经测量过的数十种陶瓷的所有实验数据都和理论很好地一致。 关键词：

THE PYROELECTRIC RELAXATION EFFECT

The homopolar charge and heteropolar charge appeared in polarized ferroelectric ceramics result in pyroelectric relaxation effect. Three types of relaxation process given by the phenomenological theory are observed. Since energy is needed for the excitation of homopolar or heteropolar charge, at times long after the temperature change of the ceramic, the pyroelectric charges decay slowly as △Q(t)=(1+r_±e^{(-(α±t)1/2)}△Q∞.The theory is in good agreement with all experimental data for dozens of kinds of ceramic which have been measured.