Abstract
The fluorescent spectra of Eu3+ and Sm3+ ions in crystals ofKTaO3, and in mixed crystals of KTaO3−KNbO3(KTN) have been studied. No energy level splittings or fluorescent intensity changes due to the crystallographic transitions were observed. Instead, extra lines appear as the niobium content is increased. These extra lines are possibly due to distortion caused by the substitution of niobium for tantalum in KTN near rare earth ions. From the ionic size of the activator ions and that of the cations in the host crystals of KTaO3 and KTN, and comparison of the fluorescent line positions of the Sm3+ ions with those in BaTiO3, it is concluded that the Sm3+ ions are predominantly substituting at the K sites. The site-symmetry possessed by the Sm3+ ions in KTaO3 and KTN is discussed.
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