Role of PO^2- ₃ radicals in charge accumulation under phosphate glasses irradiation by electrons

Search of direct indications of electron nature of ESR centre with g-factor equal 2.024±0.005, superfine interaction constant A=75 mTl was undertaken. The role of the centre in radiation electrization of glass-like Al₂(PO₃)₃ under 150 keV electron pulsed irradiation was studied. By means of combining increased irradiation temperature and conditioning after irradiation at room temperature only D₂ centres can be selectively isolated, which proved to be the most stable ones as compared with other centres. Temperature range, in which intensive emission of electrons is liberation from traps, falls on the boundary of thermal stability of the D₂ centres and on the range of the highest decay rate of external electric field. Thus, the D₂ centres, which are phosphate radicals of end type, proved to be electron traps.