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The displacements of Fe3+ ions and hence the structures of Fe3+-V-O defects in ABO(3) oxide perovskites are studied by analyzing their electron paramagnetic resonance data from the high-order perturbation formula of zero-field splitting on the basis of the spin-orbit coupling mechanism. The results suggest that the Fell ions in the Fell-V, defect centers are displaced away from the oxygen vacancy V-O by about 0.035 nm. The reasonableness of the displacement is discussed.