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

Tapia-Ruiz, Nuria and Sorbie, Natalie and Vaché, Nicolas and Hoang, Tuan K. A. and Gregory, Duncan H. (2013) Rapid microwave synthesis, characterization and reactivity of lithium nitride hydride, Li4NH. Materials, 6 (11). pp. 5410-5426. ISSN 1996-1944

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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 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).

Item Type:
Journal Article
Journal or Publication Title:
Materials
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2500
Subjects:
ID Code:
84186
Deposited By:
Deposited On:
23 Jan 2017 13:18
Refereed?:
Yes
Published?:
Published
Last Modified:
11 Feb 2020 03:14