Abstract
In this paper, we interpret crystal field parameters in the angular overlap model of Jørgensen, involving σ and π effects. We have studied some trivalent rare earth ions in several compounds: KY 3F 10, the aluminates LnAlO 3, LaCl 3 and Ln(OH) 3. In all cases σ effects are dominant; e σ values decrease as the atomic number of the rare earth ion increases. For the rare earth fluorine bonding the obtained values for e π are the greatest. It may also be noted that e σ and e π parameters are connected with the B 6 m crystal field parameters. Finally, we have shown for several compounds, the existence of a power law especially for σ effects.
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