Studies on Standard Formation Enthalpies of Rare Earth Compounds by Using Structural Parameters

The atomic structural parameter P i=(Z i /n i ) (1+n i */n i) (1+m i/Z) and the molecular structural parameter P=Σni=1P i are defined. The standard formation enthalpies (Δ f H  m) of 74 species of rare earth compounds were studied with P , and the correlation coefficient is R >0 94. The structural factors and the properties of rare earth compounds are influenced by the Z i , n i *, n i, m i, Z . This study has special referential value to predict the properties of rare earth compounds.