DEPENDENCE OF THE RARE-EARTH-METAL SOLUBILITY IN SOLID MAGNESIUM ON ITS ATOMIC-NUMBER

The existence of the regular connection betw een the rare earth metal solubility in solid magnesium and its atomic number is shown. For the elements of the lanthanum row the solubility values successively incre ase the atomic number, except for europium and ytterbium, which have a n anomalous small solubility. In general, solubility increases in acco rdance with the decrease of the atomic radius of the rare earth metal as far as the difference between sizes of the rare earth metal and mag nesium atoms becomes less there, Nevertheless, some solubility changes do not correspond to the rare earth atomic radius values.