The optical absorption and emission spectra of Tb3+ in TbPO4 in its tetragonal structure above 2.3 K are studied to obtain the energies, symmetry types, and wave functions of mainly the lowest crystal field components of the ground term 7F6. Crystal field parameters are evaluated and used to calculate the anisotropy of the single‐ion energy in a semi‐classical way. This gives interesting indications for the types of magnetic structures and Jahn‐Teller distortion which occur in this substance below 2.3 K.
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Böhm et al. (1984) studied this question.
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