In:
The Journal of Chemical Physics, AIP Publishing, Vol. 132, No. 2 ( 2010-01-14)
Abstract:
The search for the stable single-bonded (polymeric) solid nitrogen attracted much attention in view of its potential application as a high energy density material. In this study, the stability of different candidate polymeric structures of nitrogen has been studied using ab initio calculations based on density-functional theory for the first time, from the angles of thermodynamic stabilities, mechanical stabilities, and dynamical stabilities in the pressure range from 0 to 360 GPa, respectively. According to our results, only Cmcm, A7, rcg, cg, BP, P212121, and Pba2 are competitive structures and more favorable than sc, ch, LB, and cw strcutrues; their stable pressure range were also presented. Among the competitive structures, BP, Pba2, and P212121 are the novel ones for their enthalpies are lower than the cg structure above 170 GPa. We further identify that the P212121 phase can transform to cg structure at pressure below 60 GPa. Also a new phase transition sequence with increasing pressure has been presented, which is from the molecular phase ε-N2 to cg at 47 GPa, to Pba2 at 170 GPa, and then to P212121 at 307 GPa.
Type of Medium:
Online Resource
ISSN:
0021-9606
,
1089-7690
Language:
English
Publisher:
AIP Publishing
Publication Date:
2010
detail.hit.zdb_id:
3113-6
detail.hit.zdb_id:
1473050-9
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