Band-gap variation in RScO3 (R = Pr, Nd, Sm, Eu, Gd, Tb, and Dy): X-ray absorption and O K -edge x-ray emission spectroscopies.

The electronic structure of rare-earth scandâtes #Sc03 {R: newly studied Pr, Nd, Eu, and Tb, compared with previously studied Sm, Gd, and Dy) was analyzed by a combined use of O AT absorption and emission spectroscopies and Sc L-edge absorption spectroscopy. This permitted the estimation of band gaps by use of a method that differed from optical measurements. The band-gap variation over the series in dependence on the rare-earth ion is analyzed, and a correlation between the Sc-0 mean distance and the band gap is found and discussed. [ABSTRACT FROM AUTHOR]