ELECTRON-PARAMAGNETIC-RESONANCE STUDY OF DRY CEMENTS

Measured X-range Electron Paramagnetic Resonance (EPR) spectra of dry cements are showing that the configuration of iron ions is mainly in F e3+ oxidation state in distorted octahedral and purely tetragonal symm etry of the surrounding ligands. This is reflected in the deformation of the sextet spectra of Mn2+ ions (g-factor value of 2.0018, simulate d as g(perpendicular to) = g(parallel to) = 2.0018, A(perpendicular to ) = A(parallel to) = 8.8 mT, pp = 1.0 mT) by the addition of parallel component of the EPR spectrum of Fe3+ ion. All spectra were measured a t the temperature of 293 K.