TY - GEN N1 - Optica Applicata, Vol. 35, 2005, nr 3, s. 347-354 N2 - The as-grown PrAlO3 single crystals grown by the Czochralski method are brown colored and after annealing in the reducing atmosphere (20%) H2/N2 they change the color to green. The X-ray photoelectron spectroscopy was used to study the chemical composition and electronic structure of PrAlO3 single crystals before and after the thermal treatment. The core electron lines of praseodymium, aluminum and oxygen were measured and deconvoluted into the synthetic peaks to determine the chemical shifts. The mixed ionic and covalent character of bonds was found. The praseodymium valency may influence the coloration of the PrAlO3 crystal. In the as-grown sample an additional Pr 3d3/2 peak at about 965 eV has higher intensity than that in the annealed one and is attributed to the presence of Pr4+ ions. The measurements showed the reduction of oxygen during thermal treatment and that interstitial oxygen was not removed in this process. L1 - http://www.dbc.wroc.pl/Content/72644/optappl_3503p347.pdf M3 - artykuł L2 - http://www.dbc.wroc.pl/Content/72644 PY - 2005 KW - optyka KW - characterization KW - praseodymium compounds KW - perovskites KW - oxides C1 - Wszystkie prawa zastrzeżone (Copyright) A1 - Kruczek, Magdalena A1 - Talik, Ewa A1 - Pawlak, Dorota A. A1 - Łukasiewcz, Tadeusz A2 - Gaj, Miron. Redakcja A2 - Wilk, Ireneusz. Redakcja PB - Oficyna Wydawnicza Politechniki Wrocławskiej C6 - Dla wszystkich w zakresie dozwolonego użytku LA - eng CY - Wrocław T1 - X-ray photoelectron spectroscopy studies of PrAlO3 crystals before and after thermal treatment UR - http://www.dbc.wroc.pl/dlibra/publication/edition/72644 ER -