The fluorescent transitions5D0.1 →7FJ (J=0−4) of the europium ion in the Tb1.8Eu0.2 (MoO4)3 single crystal were recorded at 300 and 20 K. The forbidden and the hypersensitive transitions were observed in this system. The intensity ratio between5D0 →7F1 and5D0 →7F2 which is 1:5 is discussed in the light of covalency between the Eu3+ ion and MoO4 tetrahedra.
Volume 96, 2022
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