Anomalous After-Effect with Quartz

Abstract

THE true and the apparent resistivities of some dielectrics have been found by S. W. Richardson (Proc. Roy. Soc., A, 92; 1916; 107; 1925), one of the writers (the paper is now in the press at the Tôhoku Imperial University), and others. The apparent resistivity of quartz under a certain constant applied potential increases rapidly with time and then gradually tends to a saturation value after about 30 minutes for quartz plate cut perpendicular to its optical axis. (The resistivity is measured by conducting charge through dielectrics under various applied potentials, and the time means the duration of the application of a constant potential.)