Local trapping sites in Y2O3 and Sc2O3 ceramics

Heat-stimulated luminescence (HSL) of x-ray-irradiated Y2O3, Y2O3:Eu, and Sc2O3 ceramics samples is investigated. An analysis of the form of the elementary contours making the HSL curves shows that recombination processes at the HSL peaks with maxima at 110, 122, 176, 185, 200, and 247 K in Y2O3. ceramics and with those at 121, 136, 200, 215, and 221 K in Sc2O3 are described in terms of linear kinetics. The spectral composition of the HSL of the ceramic obtained is studied. Some methods are employed to determine the activation energies and frequency factors corresponding to the HSL peaks. It is established that the recombination processes occurring upon release of the trapping sites in the Y2O3 and Sc2O3 ceramic samples are conditioned by diffusion-controlled tunneling recombination due to heat-stumulated migration of Vk-centers. © Plenum Publishing Corporation 1997.