The position of americium within lanthanides in respect to unit cell volumes of isostructural compounds. A comparison of covalency in lanthanide and actinide compounds

Abstract

The position of americium within lanthanides in respect to unit cell volumes has been determined for 25 isostructural M_mX_n compounds. A linear correlation between the position of americium and the electronegativity of X atom has been demonstrated. This result has been explained in terms of greater covalent shortening of Am-X than of Ln-X bonds.