Stabilities and defect-mediated lithium-ion conduction in a ground state cubic Li3N structure

Physical Chemistry Chemical Physics : PCCP
Manh Cuong NguyenKai-Ming Ho

Abstract

A stable ground state structure with cubic symmetry of Li3N (c-Li3N) is found by an ab initio initially symmetric random-generated crystal structure search method. Gibbs free energy, calculated within quasi-harmonic approximation, shows that c-Li3N is the ground state structure for a wide range of temperatures. The c-Li3N structure has a negative thermal expansion coefficient at temperatures lower than room temperature, mainly due to two transverse acoustic phonon modes. This c-Li3N phase is a semiconductor with an indirect band gap of 1.90 eV within hybrid density functional calculations. We also investigate the migration and energetics of native point defects in c-Li3N, including lithium and nitrogen vacancies, interstitials, and anti-site defects. Lithium interstitials are found to have a very low migration barrier (∼ 0.12 eV) and the lowest formation energy among all possible defects. The ionic conduction in c-Li3N is thus expected to occur via an interstitial mechanism, in contrast to that in the well-known α-Li3N phase which occurs via a vacancy mechanism.

References

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Oct 28, 1996·Physical Review Letters·J P PerdewM Ernzerhof
Nov 26, 2002·Nature·Ping ChenKuang Lee Tan
Mar 5, 2009·Physical Review Letters·Christoph FreysoldtChris G Van de Walle
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Sep 17, 2015·Scientific Reports·Yanqing ShenZhongxiang Zhou

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Citations

Oct 13, 2016·Journal of the American Chemical Society·Yuta TsujiN W Ashcroft
Feb 3, 2018·ACS Central Science·Yanbin LiYi Cui

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