Metal polynitrides have raised significant interest for their applications as potential high-energy-density materials (HEDMs). Despite extensive research on energetic polynitrogen species, reducing synthesis pressures and realizing their recovery at ambient conditions remain challenging. Here, for the first time, the zigzag N₄ chains are successfully stabilized in the new polynitride Ce₂N₆ and recovered to ambient pressure and temperature by introducing cerium nitride as a precursor. The stable mechanism of the recoverable N₄ chain originates from the large quantity of charge captured, the favorable bonding environment, and low structural enthalpy. This study reveals the crucial role of precursors in stabilizing and recovering polynitrogen species, providing an alternative route to design and prepare novel HEDMs.

中文翻译：

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高压合成聚氮化铈中的可恢复锯齿形 N4 链


金属聚氮化物因其作为潜在的高能量密度材料 （HEDM） 的应用引起了人们的极大兴趣。尽管对含能聚氮物质进行了广泛的研究，但降低合成压力并实现它们在环境条件下的回收仍然具有挑战性。在这里，锯齿形 N₄ 链首次成功地稳定在新的聚氮化物 Ce₂N₆ 中，并通过引入氮化铈作为前驱体恢复到环境压力和温度。可回收 N₄ 链的稳定机制源于捕获的大量电荷、良好的键合环境和低结构焓。本研究揭示了前驱体在稳定和回收多氮物种中的关键作用，为设计和制备新型 HEDM 提供了另一种途径。