Mechanical and thermodynamic properties of the monoclinic and orthorhombic phases of SiC2N4 under high pressure from first principles

doi:10.1088/1674-1056/23/12/127101

Abstract First principles calculations are preformed to systematically investigate the electronic structures, elastic and thermodynamic properties of the monoclinic and orthorhombic phases of SiC₂N₄ under pressure. The calculated structural parameters and elastic moduli are in good agreement with the available theoretical values at zero pressure. The elastic constants of the two phases under pressure are calculated by stress–strain method. It is found that both phases satisfy the mechanical stability criteria within 60 GPa. With the increase of pressure, the degree of the anisotropy decreases rapidly in the monoclinic phase, whereas it remains almost constant in the orthorhombic phase. Furthermore, using the hybrid density-functional theory, the monoclinic and orthorhombic phases are found to be wide band-gap semiconductors with band gaps of about 2.85 eV and 3.21 eV, respectively. The elastic moduli, ductile or brittle behaviors, compressional and shear wave velocities as well as Debye temperatures as a function of pressure in both phases are also investigated in detail.

Keywords: SiC₂N₄ density functional theory Debye temperature elastic anisotropy

Received: 27 April 2014
Revised: 15 June 2014
Accepted manuscript online:

PACS:	71.15.Mb	(Density functional theory, local density approximation, gradient and other corrections)
	62.20.D-	(Elasticity)
	71.20.-b	(Electron density of states and band structure of crystalline solids)

Fund: Projected supported by the Henan Joint Funds of the National Natural Science Foundation of China (Grant Nos. U1304612, U1404608, and U1404216), the Special Fund for the Theoretical Physics of China (Grant No. 11247222), the Nanyang Normal University Science Foundation, China (Grant Nos. ZX2010011, ZX2012018, and ZX2014088), the National Natural Science Foundation of China (Grant Nos. 11304167 and 51374132), the Postdoctoral Science Foundation of China (Grant No. 20110491317), and the Young Core Instructor Foundation of Henan Province, China (Grant No. 2012GGJS-152).

Corresponding Authors: Zhou Da-Wei
E-mail: zhoudawei@nynu.edu.cn

Cite this article:

Miao Nan-Xi (苗楠茜), Pu Chun-Ying (濮春英), He Chao-Zheng (何朝政), Zhang Fei-Wu (张飞武), Lu Cheng (卢成), Lu Zhi-Wen (卢志文), Zhou Da-Wei (周大伟) Mechanical and thermodynamic properties of the monoclinic and orthorhombic phases of SiC₂N₄ under high pressure from first principles 2014 Chin. Phys. B 23 127101


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Mechanical and thermodynamic properties of the monoclinic and orthorhombic phases of SiC2N4 under high pressure from first principles

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Mechanical and thermodynamic properties of the monoclinic and orthorhombic phases of SiC₂N₄ under high pressure from first principles