Ionic conduction in sodium azide under high pressure: Experimental and theoretical approaches

Ionic conduction in sodium azide under high pressure: Experimental and theoretical approaches
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高压下叠氮化钠中的离子传导:实验和理论方法

DOI:
10.1063/1.5028468
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发表时间:
2018-04
影响因子:
4
通讯作者:
Chunxiao Gao
Chunxiao Gao
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Qinglin Wang;Yanzhang Ma;D;an Sang;Xiaoli Wang;Cailong Liu;Haiquan Hu;Wenjun Wang;Bingyuan Zhang;Quli Fan;Yonghao Han;Chunxiao Gao

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碱金属叠氮化物可作为合成高分子氮的起始原料,是一种具有高能量密度的潜在材料。本文利用原位阻抗谱和密度泛函理论计算,报道了叠氮化钠在高压下的离子输运行为。离子输运包括离子转移和Warburg扩散过程。给出了高压相的离子迁移通道和势垒能。γ相的离子电导率随压力的增加而增强是由于在晶界处形成了空间电荷区。纳米3在压力下的离子传导和晶界效应有助于更好地理解碱叠氮化物的传导机制,并为这些化合物和其他高能量密度多氮化物中聚合氮的研究开辟了新的领域。
Alkali metal azides can be used as starting materials for the synthesis of polymeric nitrogen, a potential material of high energy density. In this letter, we report the ionic transport behavior in sodium azide under high pressure by in situ impedance spectroscopy and density functional theory calculations. The ionic transportation consists of ion transfer and Warburg diffusion processes. The ionic migration channels and barrier energy were given for the high-pressure phases. The enhanced ionic conductivity of the γ phase with pressure is because of the formation of space charge regions in the grain boundaries. This ionic conduction and grain boundary effect in NaN3 under pressures could shed light on the better understanding of the conduction mechanism of alkali azides and open up an area of research for polymeric nitrogen in these compounds and other high-energy-density polynitrides.
DOI: 10.1063/1.4916828
发表时间: 2015-04
影响因子: 4
作者:
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