Journal of Alloys and Compounds, volume 702, pages 132-137

Prediction and characterization of the marcasite phase of iron pernitride under high pressure

Zhongyu Wang 1, 2
Yucai Li 3
Hengtao Li 3
Ismail Harran 3
Mingzhen Jia 3
Hui Wang 3
Yuanzheng Chen 3
Hongyan Wang 3
NANNAN WU 4
Publication typeJournal Article
Publication date2017-04-01
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor6.2
ISSN09258388
Materials Chemistry
Metals and Alloys
Mechanical Engineering
Mechanics of Materials
Abstract
Using the unbiased structure searching CALYPSO techniques and the first-principles calculations, we predicted a phase transition in iron pernitride (FeN2) at 22 GPa from the hexagonal R-3m structure to an orthorhombic Pnnm structure. Although the Pnnm structure is a well-known marcasite phase of transition-metal pernitrides, to our knowledge, this is the first report about the pressure-induced phase transition to the Pnnm structure in the FeN2 compound. The dynamically and mechanically stable for the Pnnm phase are evaluated, further confirming this phase transition. By assessing the elastic property of the Pnnm structure, the result indicates that it displays excellent brittle and hardness characters. Viewing it's structure, a dinitrogen unit and a coordinating iron atom characterized by N-sharing six-fold FeN6 octahedrons are found. Based on the quantum-chemical analysis, the dinitrogen unit was formulated as a quasi-molecular double-bonded N22− and a mixed covalent N N and Fe N bonding nature was identified in the structure. These structural and covalent bonding characters play a crucial role to its excellent mechanical properties. The present results extend the well-known marcasite phase in other transition-metal pernitrides to the FeN2 compound and provide a perspective toward the understanding of the synthesis and chemical bonding of N-rich FeN2 under high pressure.

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Wang Z. et al. Prediction and characterization of the marcasite phase of iron pernitride under high pressure // Journal of Alloys and Compounds. 2017. Vol. 702. pp. 132-137.
GOST all authors (up to 50) Copy
Wang Z., Li Y., Li H., Harran I., Jia M., Wang H., Chen Y., Wang H., WU N. Prediction and characterization of the marcasite phase of iron pernitride under high pressure // Journal of Alloys and Compounds. 2017. Vol. 702. pp. 132-137.
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RIS Copy
TY - JOUR
DO - 10.1016/j.jallcom.2017.01.219
UR - https://doi.org/10.1016/j.jallcom.2017.01.219
TI - Prediction and characterization of the marcasite phase of iron pernitride under high pressure
T2 - Journal of Alloys and Compounds
AU - Wang, Zhongyu
AU - Li, Yucai
AU - Li, Hengtao
AU - Harran, Ismail
AU - Jia, Mingzhen
AU - Wang, Hui
AU - Chen, Yuanzheng
AU - Wang, Hongyan
AU - WU, NANNAN
PY - 2017
DA - 2017/04/01 00:00:00
PB - Elsevier
SP - 132-137
VL - 702
SN - 0925-8388
ER -
BibTex
Cite this
BibTex Copy
@article{2017_Wang,
author = {Zhongyu Wang and Yucai Li and Hengtao Li and Ismail Harran and Mingzhen Jia and Hui Wang and Yuanzheng Chen and Hongyan Wang and NANNAN WU},
title = {Prediction and characterization of the marcasite phase of iron pernitride under high pressure},
journal = {Journal of Alloys and Compounds},
year = {2017},
volume = {702},
publisher = {Elsevier},
month = {apr},
url = {https://doi.org/10.1016/j.jallcom.2017.01.219},
pages = {132--137},
doi = {10.1016/j.jallcom.2017.01.219}
}
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