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Citation: DU Ye-Ping, CHEN Jing-Chao, FENG Jing. Mechanical Properties and Electronic Structures of Various SnO2 Crystal Structures[J]. Acta Physico-Chimica Sinica, ;2009, 25(02): 278-284. doi: 10.3866/PKU.WHXB20090214 shu

Mechanical Properties and Electronic Structures of Various SnO2 Crystal Structures

1.
Key Laboratory of Advanced Materials of Yunnan Province, Key Laboratory of Advanced Materials of Precious-Nonferrous Metals, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, P. R. China

Received Date: 8 September 2008
Available Online: 4 December 2008

Mechanical and electronic properties of different SnO2 crystal structures were studied by density functional theory. For the exchange-correction energy we employed the generalized gradient approximation (GGA) in the PBE (Perdew, Burke and Ernzerhof) form. The lattice constants, bulk modulus and Young’s modulus of the studied isomers are obtained. By comparing the space groups of Pbca and Pnam in SnO2 the Vickers hardness of the two crystal structures was found to be consistent. There was a difference in the band gap between the SnO2 isomers. Energies of valence bands varied from -10 to 0 eV and -20 to -15 eV for all SnO2 crystals. These valence bands resulted from the O 2p and 2s orbitals. Optical properties of these SnO2 isomers were also calculated. The absorption spectrum of Pnam showed a strong peak in the ultraviolet range. Rules for electron transitions were determined for the different space groups of SnO2.
- SnO2; Pressure; First principles; Optical property
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