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http://dx.doi.org/10.5012/bkcs.2013.34.2.629

Anisotropy of the Electrical Conductivity of the Fayalite, Fe2SiO4, Investigated by Spin Dimer Analysis  

Lee, Kee Hag (Department of Materials Science and Engineering, Bard Hall, Cornell University)
Lee, Jeeyoung (Department of Chemistry, Nanoscale Science and Technology Institute, Wonkwang University)
Dieckmann, Rudiger (Department of Materials Science and Engineering, Bard Hall, Cornell University)
Publication Information
Bulletin of the Korean Chemical Society / v.34, no.2, 2013 , pp. 629-632 More about this Journal
Abstract
Many properties of inorganic compounds are sensitive to changes in the point-defect concentrations. In minerals, such changes are influenced by temperature, pressure, and chemical impurities. Olivines form an important class of minerals and are magnesium-rich solid solutions consisting of the orthosilicates forsterite $Mg_2SiO_4$ and the fayalite $Fe_2SiO_4$. Orthosilicates have an orthorhombic crystal structure and exhibit anisotropic electronic and ionic transport properties. We examined the anisotropy of the electrical conductivity of $Fe_2SiO_4$ under the assumption that the electronic conduction in $Fe_2SiO_4$ occurs via a small polaron hopping mechanism. The anisotropic electrical conductivity is well explained by the electron transfer integrals obtained from the spin dimer analysis based on tight-binding calculations. The latter analysis is expected to provide insight into the anisotropic electrical conductivities of other magnetic insulators of transition metal oxides.
Keywords
Fayalite; $Fe_2SiO_4$; Anisotropic electrical conductivity; Electron hopping; Spin dimer analysis;
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