Magnetic Behavior of TbF3
Relatively little is known about the magnetic properties of rare earth fluorides, in contrast to other rare earth compounds, which have been extensively studied over the past two decades. Presumably, one of the reasons for this is that the crystal structures of the rare earth fluorides are in general much more complicated, resulting in a low symmetry point group for the rare earth site. This makes a quantitative analysis of magnetic properties very difficult. On the other hand, among the known rare earth tri-fluorides only TbF3 was reported as undergoing a magnetic phase transition at 3.95 K.I-3 Usually, the most probable magnetic coupling between paramagnetic ions in the non-conducting compounds will be a superexchange interaction via the anions. In TbF3, however, the ordering temperature is low enough that other mechanisms in addition to superexchange should be considered as a possible cause of the magnetic ordering.
KeywordsMagnetic Behavior Magnetic Phase Transition Rare Earth Compound Superexchange Interaction Neutron Diffraction Pattern
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