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1 results

  • Mössbauer effect study on the mixed valence state of iron in tourmaline

  • E. A. Ferrow, H. Annersten, R. P. Gunawardane
  • Journal:
    Mineralogical Magazine / Volume 52 / Issue 365 / April 1988
    Published online by Cambridge University Press:
    05 July 2018, pp. 221-228

  • Mössbauer spectra of iron-bearing tourmaline, obtained at different temperatures, show the existence of thermally-activated charge delocalization among clusters of iron atoms situated in the Y and Z octahedra of the tourmaline structure. The temperature dependence indicates an unusually high activation energy for the delocalization process which suggests that the process takes place between crystallographically non-equivalent sites. Annealing of the tourmaline in hydrogen is observed to inhibit the delocalization process, thus localizing the electron into the Z-site.