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Electrical conductivity, thermopower and Fe-57 Mossbauer spectroscopy of an Fe-rich amphibole, arfvedsonite

Schmidbauer, E., T. Kunzmann, T. Fehr, and R. Hochleitner (1996), Electrical conductivity, thermopower and Fe-57 Mossbauer spectroscopy of an Fe-rich amphibole, arfvedsonite, Physics and Chemistry of Minerals, 23(2), 99-106.

Abstract
The electrical charge transport was examined in an Fe-rich amphibole, arfvedsonite, using frequency dependent AC resistivity (impedance spectroscopy) and thermopower theta measurements in the temperature range 30-800 degrees C. Two different semiconducting charge transfer mechanisms were observed which are due to Volume conduction for measurements parallel and perpendicular to the [001] direction; they arise probably from a conduction mechanism related to lattice defects, both with activation energies E(A) approximate to 0.4 eV. The extrapolated DC conductivity, for a fixed temperature, along [001] is about 5-6 times higher than that perpendicular to [001]. From the temperature independent positive theta values it follows that hole conduction occurs, and a hopping-type charge transport is acting, probably effected by electron hopping Fe2+ --> Fe3+. Possible charge transfer paths are discussed. Fe-57 Mossbauer spectra enabled to determine the relative concentrations of Fe2+ and Fe3+. From a comparison of these data and from theta results it is concluded that the main fraction of Fe2+ and Fe3+ take part in long range charge transport.
BibTeX
@article{id233,
  author = {E. Schmidbauer and T. Kunzmann and T. Fehr and R. Hochleitner},
  journal = {Physics and Chemistry of Minerals},
  number = {2},
  pages = {99-106},
  title = {{Electrical conductivity, thermopower and Fe-57 Mossbauer spectroscopy of an Fe-rich amphibole, arfvedsonite}},
  volume = {23},
  year = {1996},
  language = {en},
}
EndNote
%0 Journal Article
%A Schmidbauer, E.
%A Kunzmann, T.
%A Fehr, T.
%A Hochleitner, R.
%D 1996
%N 2
%V 23
%J Physics and Chemistry of Minerals
%P 99-106
%T Electrical conductivity, thermopower and Fe-57 Mossbauer spectroscopy of an Fe-rich amphibole, arfvedsonite
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