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Square-wave voltammetry and impedance spectroscopy in iron-doped melts of the system Li2O/Al2O3/SiO2

机译:Li2O / Al2O3 / SiO2系统的铁掺杂熔体中的方波伏安法和阻抗谱

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摘要

Glass melts with the basic compositions xLi(2)O center dot 15Al(2)O(3) center dot (85 - X)SiO2 (x = 8.5, 11, 13.5, 16 and 18.5) doped with 0.25 mol% Fe2O3 were studied by square-wave voltammetry and impedance spectroscopy at temperatures in the range from 1100 to 1600 degrees C. The squarewave voltammograms show a pronounced peak attributed to the reduction of Fe3+ to Fe2+. The attributed peak potentials which are equal to the standard potentials of the redox pair decrease linearly with the temperature. Impedance spectra measured could be simulated using an equivalent circuit attributed to a simple electron transfer reaction controlled by diffusion. (c) 2006 Elsevier B.V. All rights reserved.
机译:研究了基本成分为xLi(2)O中心点15Al(2)O(3)中心点(85-X)SiO2(x = 8.5、11、13.5、16和18.5)的玻璃熔体,其中掺杂了0​​.25 mol%的Fe2O3通过方波伏安法和阻抗谱在1100至1600摄氏度的温度范围内进行分析。方波伏安图显示了一个明显的峰,这归因于Fe3 +还原为Fe2 +。与氧化还原对的标准电势相等的归属峰电势随温度线性降低。可以使用等效电路模拟测量的阻抗谱,该等效电路归因于由扩散控制的简单电子转移反应。 (c)2006 Elsevier B.V.保留所有权利。

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