This is an experimental work, devoted to the study of defects in insulators. In particular it is devoted to the study of manganese insertion in strintium titanate matrix by electron paramagnetic resonance (EPR). Weakly concentrated “as-grown” and reduced SrTiO3 :Mn crystals and ceramics are investigated by means of 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+. This work was developed in the frame of a collaboration with IOFFE INSTITUTE of Russian Academic Science of San Petersburg.
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