Nitrogen in increasing amounts has been added to separate solutions of barium in sodium of constant composition (ca. 4.40 mol % Ba) at 300 ' C . After rendering each mixture homogeneous using an electromagnetic pump, filtration, and nitrogen analysis, all the N, added has been found in solution up to a solution composition approximating to Ba,N (i.e. 1.1 mol % N) beyond which the quantity of dissolved N, decreases progressively due to precipitation of the nitride Ba,N. The solubilization is interpreted in terms of strong preferential solvation of the nitride ion by barium cations.

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