Bulletin of the Korean Chemical Society

  • 제34권2호
  • /
  • Pages.629-632
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  • 2013
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  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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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)
  • 투고 : 2012.12.11
  • 심사 : 2013.01.04
  • 발행 : 2013.02.20
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초록

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.

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참고문헌

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