Abstract

A theoretical study of hydrogen solubility in lanthan–nickel storage alloys of D2d structure and CaZn 5 type was carried out taking into account the possible arrangement of hydrogen atoms in interstitial sites of two types. The equilibrium state equation determining the P– T– c diagram was determined and hydrogen solubility isotherms were constructed. The calculation results were compared with experimental data for hydrogen solubility in binary LaNi 5, LaCu 5 and LaCo 5 alloys and various ternary phases of the examined structure.

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