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Bulk nanocrystalline Sn3N4powders were synthesised by a two step ammonolysis route. These provided good capacities in sodium and lithium cells, and good stability in sodium cells.

Combining metastable precursors with high pressure-temperature treatment is a powerful tool to make nitrogen-rich metal nitrides. Two new dense polymorphs of Ta3N5 have previously been theoretically predicted, with U3Se5 (Pnma) and U3Te5 (Pnma) structure types, and are now shown to exist. Amorphous Ta3N5 from thermal ammonolysis of an amorphous polymeric precursor was laser heated at 22 GPa and examined using synchrotron X-ray diffraction to reveal the emergence of these two novel polymorphs.

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Reactions of MoClsuggesting that redox capacitance is responsible for a significant proportion of the charge stored. Highlights: Hexagonal δ 1 -MoN <500 °C or cubic γ-Mo 2 N >600 °C from a MoCl 5 -derived polymer. High double layer capacitance in aqueous electrolyte with good cycling stability. Phase behaviour of molybdenum nitride from a Mo(NMe 2 ) 4 -derived polymer. Good capacitance and stable cycling in relatively low surface area materials. Redox peaks in the electrochemical data suggesting a largely redox-based process.