Abstract
The magnitude of the double-double /tetrad/ effect in unit cell volumes has been determined for a number of simple lanthanide compounds of the LnmXn type. The effect increases with decreasing electronegativity of the X atom, which indicates that the effect originates in the partially covalent character of the Ln-X bond.
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Siekierski, S. Correlation between the double-double effect and the contribution from covalency to bonding. Journal of Radioanalytical and Nuclear Chemistry Letters 87, 15–22 (1984). https://doi.org/10.1007/BF02204319
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DOI: https://doi.org/10.1007/BF02204319