On the nature of 4ƒ bonding in the lanthanide elements and their compounds

摘要: Abstract A new model is proposed for the electronic configuration of trivalent lanthanide metals in condensed state. It suggested that there are two kinds 4ƒ electrons—the “atomic” electrons and “band” electrons. The former which commonly associated with ions. number atomic varies from zero La to 14 Lu accounts normal magnetic susceptibilities observed elements their compounds. band electron, as name implies, one valence or conduction electron occurs because lowest empty energy levels, vary Tm, lies very close Fermi level (and thus partially occupied by electrons) not well above has been assumed previously perhaps completely ignored. about 0.7 an light lanthanides 0.1 less heavy (for no since all levels filled). does contribute susceptibility, except a electron. does, however, bonding influences melting point heat sublimation. An analysis these physical properties permits estimate fractional concentration band. influence on ionic covalent compounds also briefly discussed.