Solutions of Nitrogen in Liquid Lithium Containing Dissolved Alkaline Earth Metals: Solubilities, Precipitating Species and Phase Relationships
Several years ago we reported the results of a detailed study of the reaction of nitrogen with solutions of alkaline earth metals in liquid sodium [1–4]. For the Na-Ba-N system, resistivity  and solubility  studies of the solutions coupled with X-ray powder diffraction studies of the solid products  indicated that an initial solution process is followed by the precipitation of Ba2N which, in the presence of excess nitrogen, reacts further to form Ba3N2- Since the extent of the solution process is determined solely by the amount of barium dissolved in the liquid sodium, precipitation commencing at a Ba:N ratio of 4:1, it has been suggested  that the nitrogen, which is effectively insoluble in liquid sodium , is solvated by the barium forming a soluble “Ba4N” species. The reaction sequence, which can be summarised as follows.
KeywordsEnthalpy Lithium Barium Strontium Ba3N2
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