Structural, mechanical and electronic properties of Nb2C: First-principles calculations

Xiaojing Sha, Namin Xiao, Yongjun Guan, Xiaosu Yi

Research output: Journal PublicationArticlepeer-review

6 Citations (Scopus)

Abstract

Nb-C compounds are potential candidates to achieve high hardness and refractory nature. We performed a crystal structure search for the Nb-C system using an ab initio evolutionary algorithm implemented in the USPEX code. By comparing the formation enthalpy, a P-x phase diagram was calculated, and an orthorhombic Pnnm structure of Nb2C was predicted and denoted as Nb2C-I, which was both mechanically and dynamically stable. In this Pnnm phase, there are four-sided rings continuously along the c-axis, which probably contributes to the relatively high incompressibility of Nb2C-I along the crystallographic c-axis. Moreover, the hardness and Young's modulus were calculated to be 28.5 GPa and 448.9 GPa, respectively; hence, the Nb2C-I is considered as a potential ultra-stiff and hard material.

Original languageEnglish
Pages (from-to)33402-33407
Number of pages6
JournalRSC Advances
Volume7
Issue number53
DOIs
Publication statusPublished - 2017
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry (all)
  • Chemical Engineering (all)

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