Abstract:Impurities present in LaAlO 3 , were identified by analyzing electron spin resonance spectra and optical absorption spectra. Especially, the effects of ultraviolet photon irradiation and thermal annealing on these spectra were studied in detail. The experimental results confirm that LaAlO 3 contains Cr and Fe as impurities. They also indicate that electrons and holes are released by the irradiation of UV photons with energies higher than 4.5 eV or by the annealing in an oxidizing atmosphere at temperatures abo… Show more
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