Abstract
Optical absorption and fluorescence, magnetic susceptibility and electron magnetic resonance experiments have been made of Tb
3+
, 4f
8
, ions in lanthanide nicotinate dihydrate single crystals. Optical absorption spectroscopy in undiluted terbium nicotinate dihydrate (TbND) indicates that the ground state of Tb
3+
,
7
F
6
, is a singlet exhibiting a quadratic Zeeman effect, and this is confirmed by the observation of a temperature-independent Van Vleck paramagnetism below 4.2 K. This is what one would expect for a non-Kramers ion in a crystal field of no symmetry. In spite of this, electron paramagnetic resonance (epr) is observed from Tb
3+
ions both in dilute LaND containing 0.01 mole fraction of Tb and in TbND. In the dilute material, in spite of the absence of site symmetry, the results show a nearly degenerate non-Kramers doublet with a
g
value of 17.2(8), close to the maximum possible value of 12
g
j
; the ground state must therefore be predominantly
M
j
= ±6. The epr in TbND arises from some type of defect site involving two interacting dissimilar Tb
3+
ions. The spectrum of Tb
3+
ions observed by optical fluorescence is also attributed to defect sites.
Cited by
19 articles.
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