Open AccessTHEORETICAL ANALYSIS OF THE ELECTRICAL CONDUCTION AND DIELECTRIC BEHAVIOR OF α-LiIO<sub>3</sub> SINGLE CRYSTALS
Author(s) -
Tiecheng Li,
Zhengyi Xu
Publication year - 1977
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.26.500
Subject(s) - condensed matter physics , polarity (international relations) , dielectric , polarization (electrochemistry) , materials science , crystal (programming language) , single crystal , ionic bonding , asymmetry , thermal conduction , conductivity , electrical resistivity and conductivity , electrode , physics , nuclear magnetic resonance , chemistry , ion , optoelectronics , quantum mechanics , composite material , biochemistry , computer science , cell , programming language
By using the Debye-Hückel equation and the Poisson equation, the almost one-dimensional ionic conductive behaviors of α-LiIO3 have been analysed theoretically. The current across the boundaries between the crystal and metallic electrodes is con-sidered to be limited by rate processes. The asymmetry of the ± c-directions due to spontaneous polarization of the crystal has been taken into consideration. The explicit expression derived for the apparent DC conductivity is satisfactory in explaining the characteristic behavior of α-LiIO3, e.g., the dependence of conductivity on applied voltage, as shown experimentally in [1]. The functional relationship between the AC dielectric constant and the bias field (cf. [1]) is interpreted partially by following the approach given in [2]. It is also pointed out that the weak current constantly flowing through the wire connecting the end surfaces of opposite polarity of an α-LiIO3 single crystal (cf. [3]), as well as similar phenomena observed in our own laboratory on poled ferroelectrics such as BaxSr1-xNb2O6(x1/3), are caused by the crystal-line polarity EMF. This EMF coexists with the spontaneous, polarization Ps.