Rapid microwave synthesis, characterization and reactivity of lithium nitride hydride, Li4NH

Nuria Tapia-Ruiz, Natalie Sorbie, Nicolas Vaché, Tuan K.A. Hoang, Duncan H. Gregory

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Abstract

Lithium nitride hydride, Li4NH, was synthesised from lithium nitride and lithium hydride over minute timescales, using microwave synthesis methods in the solid state for the first time. The structure of the microwave-synthesised powders was confirmed by powder X-ray diffraction [tetragonal space group I41/a; a = 4.8864(1) Å, c = 9.9183(2) Å] and the nitride hydride reacts with moist air under ambient conditions to produce lithium hydroxide and subsequently lithium carbonate. Li4NH undergoes no dehydrogenation or decomposition [under Ar(g)] below 773 K. A tetragonal-cubic phase transition, however, occurs for the compound at ca. 770 K. The new high temperature (HT) phase adopts an anti-fluorite structure (space group Fm 3 m; a = 4.9462(3) Å) with N3- and H- ions disordered on the 4a sites. Thermal treatment of Li4NH under nitrogen yields a stoichiometric mixture of lithium nitride and lithium imide (Li3N and Li2NH respectively).

Original languageEnglish
Pages (from-to)5410-5426
Number of pages17
JournalMaterials
Volume6
Issue number11
DOIs
Publication statusPublished - 2013

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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    Tapia-Ruiz, N., Sorbie, N., Vaché, N., Hoang, T. K. A., & Gregory, D. H. (2013). Rapid microwave synthesis, characterization and reactivity of lithium nitride hydride, Li4NH. Materials, 6(11), 5410-5426. https://doi.org/10.3390/ma6115410