The reaction of molecular nitrogen with the layered subnitride Sr2N leads to intercalation and formation of single-phase Sr2N[N2]0.25 (≙Sr4N3; see scheme) under mild conditions (T=650°C, p=9 bar). N2 is reduced to the diazenide stage [N22−], while half of the strontium is oxidized to Sr2+. The intercalation is reversible.
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Prots et al. (2002) studied this question.
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