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A review is given of electron paramagnetic resonance (EPR) research of substitutional defects in ABO3 double oxides crystallizing in the perovskite structure. In section 2, the valency and lattice sites are considered. In section 3, the existence of transition metal-oxygen vacancy pairs, Me-Vo, is reviewed, and in 4, their atomic structure is analysed. In section 5, the determination of the local position of Fe 3+ at B sites in crystals undergoing ferroelectric phase transitions is presented, and its anomalously low cubic splitting EPR parameter discussed in 6

Paramagnetic point and pair defects in oxide perovskites