Abstract
Weakly concentrated “as-grown” and reduced SrTiO3:Mn crystals and ceramics are investigated by means of electron paramagnetic resonance (EPR) to get new insights concerning the Mn substitution in the strontium titanate structure. The temperature dependence of Mn2+ and Mn4+ EPR spectra strongly indicates the formation of MnO2 or MnO small particles to be the favored configuration for the Mn insertion in SrTiO3. Only a part of manganese ions incorporates into the crystal lattice in B position as Mn4+ ions.
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