Electrical conductivity of β-ferrites with AI2O3 and Ga2O3

H. Takamura, T. Kagotani, T. Tanaka, M. Homma, M. Okada

Research output: Contribution to journalArticlepeer-review

Abstract

The present paper describes the synthesis and electrical conductivity of Al- and Ga-substitutedβ""-ferrites. AI- and Ga-substitutions for β""-ferrite (K29.75(Fe1-x Mex)2O3) are possible in the range x < 0.2 and x a≤0.4, respectively. There is an isotropic decrease of the lattice constants of -1.00% for an Al-substitution of x = 0.2, while there is an anisotropic decrease of -0.75% for a Ga-substitution. The bulk ionic conductivity of Al-substituted β""-ferrite is 3.0 × 10° S·1 (250 °C) at x = 0.2, which is slightly smaller than the value of the sample without substitutions. The grain boundary conductivity of Al-substituted β''''-ferrite, however, increases up to 6.1 × 10-4 Snr' (250 °C) at x = 0.2, which is about 17 times higher than the value for β""-ferrite without substitutions. The bulk ionic conductivities of Ga-substitutedβ''''-ferrites are almost the same as those of the Al-substituted β''''-ferrites.

Original languageEnglish
Pages (from-to)796-800
Number of pages5
JournalMaterials Transactions, JIM
Volume37
Issue number4
DOIs
Publication statusPublished - 1996

Keywords

  • Alumina
  • Cadmium
  • Cole-cole plot
  • Electronic conductivity
  • Ferrite
  • Gallate
  • Ionic conductivity
  • Iron
  • Potassium

ASJC Scopus subject areas

  • Engineering(all)

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