Diffusion Mechanism of Oxide Ions in Mn-Zn-ferrites.

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  • Haneda Hajime
    National Institute for Research in Inorganic Materials
  • Ishigaki Takamasa
    National Institute for Research in Inorganic Materials
  • Tanaka Junzo
    National Institute for Research in Inorganic Materials
  • Sakaguchi Isao
    Core Research for Evolution Science and Technology of Japan Science and Techonology Corpration, c/o National Institute for Research in Inorganic Materials
  • Ichinose Noboru
    School Science and Engineering, Waseda University

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  • Difusion Mechanism of Oxide Ions in Mn-Zn-ferrites

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Abstract

Oxygen self-diffusion coefficients in a manganese zinc ferrous ferrite single crystals were determined at various oxygen partial pressures by means of a secondary ion mass spectrometer. Temperature dependence of diffusivity of oxide ions consisted of three parts. The characteristics at middle temperature range above 5 hPa oxygen partial pressure exhibited a behavior as an extrinsic one and was described as;<BR>D=4.8×10-6⋅P0.35O2 exp(-137kJ/mol/RT)cm2⋅s-1<BR>This activation energy corresponded to the barrier for the migration of oxide ions in spinel structure. The dependence of oxygen self-diffusion on oxygen partial pressure exhibited a positive sign (slope value: 0.35). This phenomenon suggests that the oxygen ions diffuse in Mn-Zn ferrite through interstitial sites above 5 hPa of the oxygen partial pressure.

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