(東北大學(xué) 材料電磁過(guò)程研究教育部重點(diǎn)實(shí)驗(yàn)室，沈陽(yáng) 110004)
摘 要: 通過(guò)分析所得的交流阻抗譜，探討了采用交流阻抗技術(shù)使用連續(xù)變化電導(dǎo)池常數(shù)法測(cè)定溶液和熔鹽電導(dǎo)率的合理實(shí)驗(yàn)條件。通過(guò)對(duì)交流阻抗等效電路進(jìn)行分析，認(rèn)為實(shí)驗(yàn)電路的交流阻抗過(guò)程是電化學(xué)極化與濃差極化共同控制的過(guò)程，對(duì)于溶液來(lái)說(shuō)，擴(kuò)散體現(xiàn)出Warburg擴(kuò)散特性，而熔鹽的擴(kuò)散體現(xiàn)出Gerischer特性。采用邊連續(xù)變化電導(dǎo)池常數(shù)公式進(jìn)行電導(dǎo)率計(jì)算時(shí)，對(duì)應(yīng)的電路電阻最好選擇對(duì)所得的Nyquist圖擬合分析所得的溶液/熔鹽與電極及導(dǎo)線電阻之和。如果考慮擬合誤差，也可以采用讀取高頻率時(shí)電路電阻的方法來(lái)進(jìn)行計(jì)算。
關(guān)鍵字: 連續(xù)變化電導(dǎo)池常數(shù)法；電導(dǎo)率；等效電路
（The Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, China）
Abstract:The alternating current (AC) impedance spectroscopies of continuously varying cell constant (CVCC) experimental conductivity cell system for solution and melts electrical conductivity measurement were analyzed. The AC impedance rational condition for electrical conductivity measurement by CVCC technique was determined. The AC impedance course of the circuit researched is controlled by both of electrochemical polarization and concentration polarization, Warburg diffusion character is represented for AC impedance diffusion course of solution, meanwhile, the melts concentration polarization impedance is assumed to be Gerischer impedance through equivalent circuit analysis of AC impedance. When the electrical conductivity is calculated by CVCC equation, the best option of the circuit resistance is the sum of solution and melts resistance and electrode and line resistance gained by fitting the equivalent circuit. If fitting error is considered, the circuit high frequency resistance is also a good option.
Key words: continuously varying cell constant technique; electrical conductivity; equivalent circuit
