Transition metal oxide perovskites by photoelectron and x-ray absorption spectroscopy

X-ray and ultraviolet photoelectron spectroscopy as well as x-ray absorption spectroscopy have been employed to investigate transition metal oxide perovskites of the general formula ABO₃ (A = La or rare-earth ion, B=trivalent transition metal ion). Systematics in the core levels and in the valence bands in the series of LaBO₃ compounds have been discussed. Lanthanum chemical shifts in the x-ray absorption spectra in this series show interesting trends. Photoelectron spectra of the solid solutions, LaNi_1−x Co _x O₃, LaNi_1−x Fe _x O₃ and LaFe_1−x Co _x O₃ show that the rigid band model is applicable to these systems. It is shown that x-ray photoelectron spectroscopy can be employed to identify multiple oxidation states of transition metal ions in oxide perovskites. Communication No. 30 from the Solid State and Structural Chemistry Unit. An erratum to this article is available at .