Abstract
Conductivity, Mössbauer Spectroscopy and Electron Spin Resonance (ESR) techniques are used to study the role of Fe in Calcium Silicate glasses. Results show that, in addition to Fe 2+ and Fe 3+ in 4 and 6-coordinated environments, α-Fe 2O 3 and magnetite-like particles are precipitated as the Fe 2O 3 content is gradually increased from 5 to 30 m/o. These results are confirmed by both Mössbauer and ESR techniques and qualitatively correlated to changes in the D.C. conductivity of the glasses.
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