Abstract
The spectroscopic properties of R 1/2Na 1/2TiO 3:Pr 3+ (R=La, Gd, Y, Lu) are investigated in the temperature range 77–500 K and interpreted in the frame of the intervalence charge transfer (IVCT) model. The model allowed locating the ground state of Pr 3+ relative to the host fundamental bands with an accuracy of 0.1–0.2 eV.
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