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Ionizing radiation-induced defects in smectite clays |
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| Authors: | D Gournis A E Mantaka-Marketou M A Karakassides D Petridis |
| Institution: | (1) Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece e-mail: dgourni@cc.uoi.gr Tel.: +30-651-98517; Fax: +30-651-97034, GR;(2) Institute of Materials Science, NCSR DEMOKRITOS, Ag. Paraskevi-Attikis, 153 10 Athens, Greece, GR;(3) Institute of Physical Chemistry, NCSR DEMOKRITOS, Ag. Paraskevi-Attikis 153 10 Athens, Greece, GR |
| Abstract: | The interaction of γ-rays with smectites induces paramagnetic defects in the structure of these clay minerals. The EPR spectra of three different smectites detect the creation of structural defects and trapping of organic free radicals in the clay structure upon irradiation. The defects are assigned to positive holes or trapped electrons stabilised by existing local charge imbalances in the mineral lattice. The organic radicals are derived from organic compounds present as impurities in the crystal lattice of the clay minerals. In addition, γ-rays cause migration of small interlayer cations (such as Li+) into the layers, as clearly evidenced by EPR and FT-IR reflectance spectroscopies. Received: 20 April 2000 / Accepted: 2 December 2000 |
| Keywords: | Gamma irradiation Smectite clays Radiation-induced defects EPR Infrared reflectance |
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