快离子导体的低频交流特性分析

快离子导体在低频(f<10⁹Hz)下具有非Debye型的介电行为。本文考虑到快离子导体的特点,依据Ngai的红外发散理论,从快离子导体的传输特点出发,解释了这种非Debye型介电行为的起因。在较高频率时,理论正确预言了材料的导纳图为一斜率小于1的直线。在较低频率时,理论与实验的偏差起因于没有考虑材料的界面效应。 关键词：

ALTERNATING CURRENT PROPERTIES ANALYSIS OF SUPERIONIC CONDUCTORS

Superionic conductors exhibit non-Debye behavior of solid dielectrics at low frequencies (f<10⁹Hz). Based on the characteristic of superionic conductors and a physical picture of Ngai's infrared divergent theory, we consider the fast ion transport as a non-Markovian process and analyze the alternating current properties of superionic conductors. The theory predicts that the admittance diagram is a line the curvature of which is less than one at higher frequencies. The discrepancy between theory and experiments at lower frequencies is due to interfacial effects.