Effect of electrical potential to aluminum coated ionic conductor glass on interfacial phenomena

摘要

Metal / ionic conductor laminates are very attractive materials for developing the sensor and actuator. Unfortunately, the effect of electrical potential on interfacial phenomena has been still unknown, however its knowledge is very important for the practical use. In this study, the microstructure, the migration of elements, the current density was investigated under the several temperature and electrical potential conditions for aluminum coated borosilicate glass containing sodium element. Electron probe micro analyzer (EPMA) shows the sodium depletion layer, which forms at glass side around the interface by applying the electrical potential. Furthermore, the aluminum diffusion from metal side was found in sodium depletion region in glass. The current density increased rapidly at first and then decreased gradually as increasing applying time of the electrical potential, which is caused by the growth of the sodium depletion layer formed near the interface in glass side. The quantity of current density was obeying the thermal activation process. The activation energy of sodium cations conduction decreased as increasing the electrical potential. Though the reverse voltage was applied to the laminates, ion electricity was not observed.