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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Density functional calculation of equilibrium geometry
and electronic structure of pyrite
QIU Guan-zhou(邱冠周), XIAO Qi(肖 奇),
HU Yue-hua(胡岳华), XU Jing(徐 竞)

Department of Mineral Processing,
Central South University, Changsha 410083, P.R.China

Abstract:The equilibrium geometry and electronic structure of pyrite has been studied using self-consistent density-functional theory within the local density approximation (LDA). The optimum bulk geometry is in good agreement with crystallographic data. The calculated band structure and density of states in the region around the Fermi energy show that valence-band maximum (VBM) is at X (100),and the conduction-band minimum (CBM) is at G (000). The indirect and direct band gaps are 0.6eVand 0.74eV,respectively. The calculated contour map of difference of charge density shows excess charge in nonbonding d electron states on the Fe sites. The density increases between sulfur nuclei and between iron and sulfur nuclei qualitatively reveal that S-S bond and Fe-S bond are covalent binding.

 

Key words: density functional calculation; electronic structure; equilibrium geometry; pyrite

ISSN 1672-7029
CN 43-1423/U

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