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

Qinglin Wang, Yanzhang Ma, Dandan Sang, Xiaoli Wang, Cailong Liu, Haiquan Hu, Wenjun Wang, Bingyuan Zhang, Quli Fan, Yonghao Han, Chunxiao Gao

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish
Article number173903
JournalApplied Physics Letters
Volume112
Issue number17
DOIs
StatePublished - Apr 23 2018

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