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Structural and magnetic properties of LiNi0.5Mn1.5O4 and LiNi0.5Mn1.5O4-δ spinels: A first-principles study |
Xin Xiao-Gui (忻晓桂), Shen Jing-Qin (沈静琴), Shi Si-Qi (施思齐) |
Department of Physics, Center for Optoelectronics Materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou 310018, China |
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Abstract Structural and magnetic properties of LiNi0.5Mn1.5O4 and LiNi0.5Mn1.5O4-δ are investigated using density-functional theory calculations. Results indicate that nonstoichiometric LiNi0.5Mn1.5O4-δ and stoichiometric LiNi0.5Mn1.5O4 exhibit two different structures, i.e., the face-centred cubic (Fd-3m) and primitive, or simple, cubic (P4332) space groups, respectively. It is found that the magnetic ground state of LiNi0.5Mn1.5O4 (P4332 and Fd-3m) is ferrimagnetic state in which the Ni and Mn sublattices are ferromagnetically ordered along the [110] direction whereas they are antiferromagnetic with respect to each other. We demonstrate that it is the presence of O-vacancy in LiNi0.5Mn1.5O4-δ with the Fd-3m space group that results in its superior electronic conductivity compared with LiNi0.5Mn1.5O4 with the P4332 space group.
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Received: 21 May 2012
Revised: 19 June 2012
Accepted manuscript online:
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PACS:
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82.47.Aa
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(Lithium-ion batteries)
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31.15.A-
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(Ab initio calculations)
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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 National Natural Science Foundation of China (Grant Nos. 51072183 and 50802089) and the Natural Science Foundation of Zhejiang Province, China (Grant No. Y4090280). |
Corresponding Authors:
Shi Si-Qi
E-mail: siqishihz@gmail.com
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Cite this article:
Xin Xiao-Gui (忻晓桂), Shen Jing-Qin (沈静琴), Shi Si-Qi (施思齐) Structural and magnetic properties of LiNi0.5Mn1.5O4 and LiNi0.5Mn1.5O4-δ spinels: A first-principles study 2012 Chin. Phys. B 21 128202
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