Issue 17, 2018, Issue in Progress

Theoretical research on novel orthorhombic tungsten dinitride from first principles calculations

Abstract

Tungsten nitrides have been intensely studied for technological applications owing to their unique mechanical, chemical, and thermal properties. Combining first-principles calculations with an unbiased structural searching method (CALYPSO), we uncovered a novel orthorhombic structure with a space group Cmc21 as the thermodynamically most stable phase for tungsten dinitride (WN2) between 46–113 GPa. The computed elastic constants and phonons reveal that the Cmc21-WN2 structure is dynamically stable at atmospheric pressure. Moreover, hardness calculations indicate that this structure is likely to become a hard material. Our current results may stimulate further experimental work on synthesizing these technologically important materials and improve the understanding of the pressure-induced phase transitions of other transition-metal light-element compounds.

Graphical abstract: Theoretical research on novel orthorhombic tungsten dinitride from first principles calculations

Article information

Article type
Paper
Submitted
04 Feb 2018
Accepted
24 Feb 2018
First published
05 Mar 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 9272-9276

Theoretical research on novel orthorhombic tungsten dinitride from first principles calculations

Q. Li, J. Wang and H. Liu, RSC Adv., 2018, 8, 9272 DOI: 10.1039/C8RA01099D

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