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Using electron spin resonance, lattice position and dynamic properties ofMn2+ ions were studied in 0.5 and 2 % manganese doped SrTiO3 ceramics preparedby conventional mixed oxide method. The measurements showed that Mn2+ ionssubstitute preferably up to 97 % for Sr if the ceramics is prepared with adeficit of Sr ions. Motional narrowing of the Mn2+ ESR spectrum was observedwhen temperature increases from 120 K to 240-250 K that was explained as amanifestation of off-center position of this ion at the Sr site. From theanalysis of the ESR spectra the activation energy Ea = 86 mV and frequencyfactor 1/?0 ? (2-10)x10^(-14) 1/s for jumping of the impurity betweensymmetrical off-center positions were determined. Both values are in agreementwith those derived previously from dielectric relaxation. This proves theorigin of dielectric anomalies in SrTiO3:Mn as those produced by thereorientation dynamics of Mn2+ dipoles.Comment: 16 pages, 6 figure

physical review. b, condensed matter and materials physics

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Electron spin resonance investigation ofMn2+ions and their dynamics in Mn-dopedSrTiO…