Impedance of molybdenum electrodes in a soda-lime-silica glass melt

Abstract

Impedance measurements at molybdenum electrodes in a soda-lime-silica glass melt were carried out in a frequency range of 0.1 to 10^5 Hz. The spectra obtained were quite different depending on the DC potential superimposed. Thus, spectra obtained from anodically passivated electrodes could be clearly distinguished from those of electrodes with a MoSix-surface layer and from unprotected electrodes. Although the physical interpretation of the spectra obtained is very difficult, and up to now unsatisfactory, impedance measurements seem to be suitable for measuring and controlling passivating layers at molybdenum electrodes.