Radiation-stimulated point defects in Li2B4O7 single crystals

Abstract

Using thermally stimulated luminescence, optical absorption, and x-ray crystallographic analysis methods, it is established that oxygen vacancies appear near Li ions in lithium tetraborate single crystals after the crystals are irradiated with (Sr:Y)-90 β particles with dose 7×105 Gy and that these vacancies are capable of trapping one or two electrons, which are freed at temperatures 565 and 630 K, respectively. It is shown that hole localization on oxygen ions, joining triply and quadruply coordinated boron ions near Li vacancies, and freeing of the holes at 414 K are possible.