Spontaneous migration of alkalis in glass irradiated by the electron beam

If the glass is exposed by fast electrons the ionized alkali cations can be released from their original sites and are driven by the electric field de eper inside to the glass. The decay curves were measured and two migration regimes have been revealed for alkali ions in the glass. The first regime, the incubation period, is characterised by the individual ion migration, an d by the linear-like decay in the decay curve. If the number of released al kali ions achieves the percolation point the first regime bursts into the r egime of spontaneous,migration that is characterised by the cooperative tra nsport of alkalis and by the rapid exponential decay in the decay curve.