CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Mechanical, elastic, anisotropy, and electronic properties of monoclinic phase of m-SixGe3-xN4 |
Zhen-Yang Ma(马振洋), Fang Yan(阎芳), Su-Xin Wang(王苏鑫), Qiong-Qiong Jia(贾琼琼), Xin-Hai Yu(于新海), Chun-Lei Shi(史春蕾) |
Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China |
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Abstract The structural, mechanical, elastic anisotropic, and electronic properties of the monoclinic phase of m-Si3N4, m-Si2GeN4, m-SiGe2N4, and m-Ge3N4 are systematically investigated in this work. The calculated results of lattice parameters, elastic constants and elastic moduli of m-Si3N4 and m-Ge3N4 are in good agreement with previous theoretical results. Using the Voigt-Reuss-Hill method, elastic properties such as bulk modulus B and shear modulus G are investigated. The calculated ratio of B/G and Poisson's ratio v show that only m-SiGe2N4 should belong to a ductile material in nature. In addition, m-SiGe2N4 possesses the largest anisotropic shear modulus, Young's modulus, Poisson's ratio, and percentage of elastic anisotropies for bulk modulus AB and shear modulus AG, and universal anisotropic index AU among m-SixGe3-xN4 (x=0, 1, 2, 3.) The results of electronic band gap reveal that m-Si3N4, m-Si2GeN4, m-SiGe2N4, and m-Ge3N4 are all direct and wide band gap semiconducting materials.
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Received: 08 August 2017
Revised: 06 September 2017
Accepted manuscript online:
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PACS:
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61.50.-f
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(Structure of bulk crystals)
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61.50.Ah
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(Theory of crystal structure, crystal symmetry; calculations and modeling)
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71.20.Nr
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(Semiconductor compounds)
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71.55.Cn
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(Elemental semiconductors)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61601468), the Fundamental Research Funds for the Central Universities, China (Grant No. 3122014C024), and the Fund for Scholars of Civil Aviation University of China (Grant No. 2013QD06X). |
Corresponding Authors:
Zhen-Yang Ma
E-mail: zyma@cauc.edu.cn
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Cite this article:
Zhen-Yang Ma(马振洋), Fang Yan(阎芳), Su-Xin Wang(王苏鑫), Qiong-Qiong Jia(贾琼琼), Xin-Hai Yu(于新海), Chun-Lei Shi(史春蕾) Mechanical, elastic, anisotropy, and electronic properties of monoclinic phase of m-SixGe3-xN4 2017 Chin. Phys. B 26 126105
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