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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 Mg2SiO4 and the fayalite Fe2SiO4. Orthosilicates have an orthorhombic crystal structure and exhibit anisotropic electronic and ionic transport properties. We examined the anisotropy of the electrical conductivity of Fe2SiO4 under the assumption that the electronic conduction in Fe2SiO4 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.

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

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