Rapid Microwave Synthesis, Characterization and Reactivity of Lithium Nitride Hydride, Li₄NH.
Rapid Microwave Synthesis, Characterization and Reactivity of Lithium Nitride Hydride, Li₄NH.
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DOI：
10.3390/ma6115410
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发表时间：
2013-11-21
期刊：
影响因子：
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通讯作者：
Gregory DH
中科院分区：
文献类型：
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作者：
Tapia-Ruiz N;Sorbie N;Vaché N;Hoang TKA;Gregory DH
氮化锂氢化物，Li 4 NH，是由氮化锂和氢化锂在几分钟的时间尺度内合成的，首次在固态下使用微波合成方法。微波合成粉末的结构通过粉末X射线衍射[四方空间群I41/a; a = 4.8864（1）Å，c = 9.9183（2）Å]确认，并且氮氢化物在环境条件下与潮湿空气反应产生氢氧化锂，随后产生碳酸锂。Li 4 NH在低于773 K时[在Ar（g）下]不发生脱氢或分解。然而，四方-立方相变发生的化合物在约。七十七万新的高温（HT）相采用反萤石结构（空间群Fmm; a = 4.9462（3）<$），N3−和H−离子在4a位上无序。在氮气下热处理Li 4 NH产生氮化锂和酰亚胺锂的化学计量混合物（分别为Li 3 N和Li 2NH）。
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 Fmm; 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).