Electron spin resonance studies of reduced and unreduced lead silicate glasses

Abstract A measurement of the electron spin resonance spectrum of unreduced and reduced lead silicate glasses containing 50 mole per cent of PbO indicates that in addition to iron impurity signals occuring with g -values of 4.28 and 2.01, there is a signal at g = 1.915 which only occurs in the reduced samples. The intensity of the signal varies directly with the induced surface conductivity and, hence can be used as a tool to study the surface conductivity variation as a function of reducing schedules. At present the origin of this signal has not been definitely established.