Surface roughness effects at lithium silicate glass/blocking metal interfaces
Abstract Under carefully controlled conditions, with a clean glass surface free from corrosion products, the interface between lithium disilicate glass and blocking metal electrodes has an impedance response that agrees qualitatively with the predictions of the de Levie model. As the glass surface is increasingly roughened, the electrode response in the complex impedance plane shows increasing departures from the ideal vertical spike at high frequencies but returns to a more ideally capacitive response at lower frequencies. Some guidelines are given for interpreting low frequency impedance data and for distinguishing between the effects of interfacial roughness, surface layers and electrochemical phenomena.