Ion conduction and space-charge polarization processes in Li2Ge7O15 crystals

被引：0

作者：

M. D. Volnyanskii

S. N. Plyaka

M. P. Trubitsyn

Yahia A. H. Obaidat

机构：

[1] Gonchar National Dnepropetrovsk University,

来源：

Physics of the Solid State | 2012年 / 54卷

关键词：

Charge Carrier; Equivalent Circuit; Complex Impedance; Charge Transfer Activa Tion; Transfer Activa Tion Energy;

D O I：

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中图分类号：

学科分类号：

摘要：

The electrical properties of a lithium heptagermanate (Li2Ge7O15) crystal have been studied in DC and AC measuring fields at temperatures from 500 to 700 K. In a DC field, a substantial decrease of electrical conductivity σ with time has been detected. On the basis of kinetic dependences σ(t), estimates of the charge carrier diffusion coefficient D have been obtained. In the frequency range 101–105 Hz, the spectra of complex impedance ρ*(f) have been measured. The analysis of diagrams in the complex plane (ρ″–ρ′) has been performed within the equivalent circuit approach. It has been shown that, in the considered temperature and frequency intervals, the electrical properties of Li2Ge7O15 crystals have been determined by the hopping conduction of interstitial lithium ions ALi and accumulation of charge carriers near the blocking Pt electrodes.

引用

页码：499 / 503

页数：4