CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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First-principles study of the structural, mechanical and electronic properties of ZnX2O4 (X=Al, Cr and Ga) |
Zhang Liang(张良)a)b), Ji Guang-Fu(姬广富) b)†, Zhao Feng(赵峰)a), and Gong Zi-Zheng(龚自正)c) |
a Science and Technology of Shock Wave and Detonation Physics Laboratory, Institute of Fluid Physics, Chinese Academy of Engineering Physics, Mianyang 621900, China; b College of Physical Science and Technology, Sichuan University, Chengdu 610065, China; c Beijing Institute of Spacecraft Environment Engineering, Beijing 100094, China |
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Abstract This paper performs first-principles calculations to study the structural, mechanical and electronic properties of the spinels ZnAl2O4, ZnGa2O4 and ZnCr2O4, using density functional theory with the plane-wave pseudopotential method. Our calculations are in good agreement with previous theoretical calculations and the available experimental data. The studies in this paper focus on the evolution of the mechanical properties of ZnAl2O4, ZnGa2O4 and ZnCr2O4 under hydrostatic pressure. The results show that the cubic phases of ZnAl2O4, ZnGa2O4 and ZnCr2O4 become unstable at about 50 GPa, 40 GPa and 25 GPa, respectively. From analysis of the band structure of the three compounds at equilibrium volume, it obtains a direct band gap of 4.35 eV for ZnAl2O4 and 0.89 eV for ZnCr2O4, while ZnGa2O4 has an indirect band gap of 2.73 eV.
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Received: 25 September 2010
Revised: 04 November 2010
Accepted manuscript online:
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PACS:
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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64.60.A-
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(Specific approaches applied to studies of phase transitions)
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62.20.D-
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(Elasticity)
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71.20.-b
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(Electron density of states and band structure of crystalline solids)
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Fund: Project supported by the Open Research Fund of the State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology (Grant No. GCTKF2010017) and the National Basic Research Program of China (Grant No. 2010CB731600). |
Cite this article:
Zhang Liang(张良), Ji Guang-Fu(姬广富), Zhao Feng(赵峰), and Gong Zi-Zheng(龚自正) First-principles study of the structural, mechanical and electronic properties of ZnX2O4 (X=Al, Cr and Ga) 2011 Chin. Phys. B 20 047102
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