Pressure dependence of electrical conductivity of (Mg,Fe)SiO3 ilmenite

Tomoo Katsura, Sho Yokoshi, Kazuyuki Kawabe, Anton Shatskiy, Maki Okube, Hiroshi Fukui, Eiji Ito, Akifumi Nozawa, Ken Ichi Funakoshi

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

The electrical conductivity of (Mg0.93Fe0.07) SiO3 ilmenite was measured at temperatures of 500-1,200 K and pressures of 25-35 GPa in a Kawai-type multi-anvil apparatus equipped with sintered diamond anvils. In order to verify the reliability of this study, the electrical conductivity of (Mg0.93Fe0.07)SiO3 perovskite was also measured at temperatures of 500-1,400 K and pressures of 30-35 GPa. The pressure calibration was carried out using in situ X-ray diffraction of MgO as pressure marker. The oxidation conditions of the samples were controlled by the Fe disk. The activation energy at zero pressure and activation volume for ilmenite are 0.82(6) eV and -1.5(2) cm3/ mol, respectively. Those for perovskite were 0.5(1) eV and -0.4(4) cm3/mol, respectively, which are in agreement with the experimental results reported previously. It is concluded that ilmenite conductivity has a large pressure dependence in the investigated P-T range.

Original languageEnglish
Pages (from-to)249-255
Number of pages7
JournalPhysics and Chemistry of Minerals
Volume34
Issue number4
DOIs
Publication statusPublished - 2007 May 1

Keywords

  • Activation volume
  • Electrical conductivity
  • Ilmenite
  • Pressure dependence

ASJC Scopus subject areas

  • Materials Science(all)
  • Geochemistry and Petrology

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