Growth and recharging processes of chromium ions in SrGdGa3O7 and SrLaGa3O7 single crystals incorporated during growth or doping by diffusion (only for SrLaGa3O7 crystal) were analyzed. The annealing at 1000°C in air and ionizing with gamma rays (doses from 103 to 105 Gy) and protons (1014 cm-2 only for SrGdGa3O7 crystal) were performed. Different kinds of chromium ions valency, from two to four, were found. Electron spin resonance measurements in the temperature range 5-300K with the use of Brucker spectrometer were also done.
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Kaczmarek et al. (1999) studied this question.
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