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Defect Structure and Electrical Conductivity of Crystalline Ferrous Silicate

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Defects and Transport in Oxides

Part of the book series: Battelle Institute Materials Science Colloquia ((BIMSC))

Abstract

The possible disorder types in iron orthosilicate, 2Fe1-yO.SiO2 are discussed on the basis of knowledge of its crystal structure and the defect structure of transition-metal oxides. The defect structure has been investigated by electrical-conductivity and gravimetric measurements in CO2-CO atmospheres in the temperature range 1000 to 1150°C. The results are consistent with a disorder type of doubly ionized iron vacancies and an equivalent number of electron holes. In comparison with Fe1-yO, the point-defect concentrations in the iron orthosilicate are found to be lower by a factor of 102. For the interpretation of conductivity, the same models as for transition-metal oxides have been used. The Po2 dependence and Seebeck coefficient indicate a p conduction. The calculated mobility of electron holes of 6 x 10-3 cm2/v-sec as well as the activation enthalpy for motion of 5.8 kcal/mole suggest a small polaron mechanism.

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Authors and Affiliations

  1. Erlangen University, Erlangen, West Germany

    H. G. Sockel

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  1. H. G. Sockel
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Editors and Affiliations

  1. Materials Science Department, Battelle Memorial Institute, Columbus Laboratories, USA

    Martin S. Seltzer  & Robert I. Jaffee  & 

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Sockel, H.G. (1974). Defect Structure and Electrical Conductivity of Crystalline Ferrous Silicate. In: Seltzer, M.S., Jaffee, R.I. (eds) Defects and Transport in Oxides. Battelle Institute Materials Science Colloquia. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-8723-1_18

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  • DOI: https://doi.org/10.1007/978-1-4615-8723-1_18

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4615-8725-5

  • Online ISBN: 978-1-4615-8723-1

  • eBook Packages: Springer Book Archive

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