Abstract
Symmetry and electrostatic equilibrium in lanthanide compounds are discussed with the aim of improving the role of obtaining the charge factors, gj, of the nearest neighbours (NN) of the lanthanide site, j running over the NN, now using the gj vs Rj (the NN position) linear behaviour. The simple overlap model (SOM) and the method of equivalent nearest neighbours (MENN), are used in order to calculate the crystal field parameters and the 7F1 level splitting in complexes, crystals and glass. An inferior limit of the gj position is predicted for crystals and complexes, which is around the limit of 5s and 5p filled shells and may indicate different contraction/extension of the 4f wave functions. Further, it is discussed the possibility that, perhaps, the B4q and B6q parameters are not dependent on Rj in the same way as the B2q parameter is.
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