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

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Abstract

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,g 1 = 1.9764,g 2 = 1.9527 andg 3 = 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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Correspondence to A. Tani.

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Tani, A., Yamanaka, C., Ikeya, M. et al. ESR study of a new electron center in synthetic stishovite, a high-pressure polymorph of silica. Appl. Magn. Reson. 18, 559–564 (2000). https://doi.org/10.1007/BF03162302

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Keywords

  • Electron Spin Resonance
  • Electron Spin Resonance Spectrum
  • Microwave Power
  • Electron Spin Resonance Signal
  • Electron Center