Applied Magnetic Resonance

, Volume 18, Issue 4, pp 559–564 | Cite as

ESR study of a new electron center in synthetic stishovite, a high-pressure polymorph of silica

  • A. Tani
  • C. Yamanaka
  • M. Ikeya
  • O. Ohtaka
  • T. Katsura


A new unidentified electron center in γ-ray-irradiated synthetic stishovite, a high-pressure polymorph of SiO2, was detected by X-band electron spin resonance. It has an anisotropicg-factor of orthorhombic symmetry,g1 = 1.9764,g2 = 1.9527 andg3 = 1.9370. The signal intensity was saturated at a microwave power of 2 mW. Annealing experiments show that the center was annealed out around 280 K and unstable at room temperature. The center may be ascribed to a titanium electron center on the basis of a relatively largeg-shift and a comparison with the paramagnetic centers in quartz.


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Copyright information

© Springer 2000

Authors and Affiliations

  • A. Tani
    • 1
  • C. Yamanaka
    • 1
  • M. Ikeya
    • 1
  • O. Ohtaka
    • 1
  • T. Katsura
    • 2
  1. 1.Department of Earth and Space ScienceOsaka UniversityOsakaJapan
  2. 2.Institute for Study of the Earth’s InteriorOkayama UniversityTottoriJapan
  3. 3.Ocean Research InstituteUniversity of TokyoTokyoJapan

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