Ac conductivity and ion transport in K+-for-Na+ ion-exchanged glasses:: exchange experiments below and above the glass transition temperature

被引:14
作者
Dubiel, M
Roling, B
Füting, M
机构
[1] Univ Munster, Inst Chem Phys, Sonderforschungsbereich 458 DFG, D-48149 Munster, Germany
[2] Univ Halle Wittenberg, Fachbereich Phys, D-06108 Halle An Der Saale, Germany
[3] Univ Halle Wittenberg, Sonderforschungsbereich 418 DFG, D-06108 Halle An Der Saale, Germany
[4] Inst Halle, Fraunhofer Inst Werkstoffmech, D-06108 Halle An Der Saale, Germany
关键词
D O I
10.1016/j.jnoncrysol.2003.08.073
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Samples of commercial soda-time silicate glass were ion exchanged in KNO3/NaNO3 melts below and slightly above the glass transition temperature (T-G), and the ion dynamics and transport were characterized by means of ac conductivity spectroscopy. Our results demonstrate unambiguously that mixed alkali effects are present in ion-exchanged glasses. However, these effects depend strongly on the thermal history. For the glasses exchanged below T-G we do not observe a conductivity minimum as a function of the degree of exchange, in agreement with the results of other studies. On the other hand, when the exchange was done slightly above T-G, a conductivity minimum was detected. Nevertheless, the spectral shape of the conductivity and the dependence of the dc conductivity on the degree of exchange point to significant differences in the ion dynamics between glasses exchanged slightly above T-G and mett-grown glasses of the same compositions. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码:11 / 19
页数:9
相关论文
共 42 条