Two new axial Fe'" centres, arising after reduction of stoichiometric lithium niobate crystals grown horn melts containing &O. were discovered and investigated by EPR. Their b: crystal field parameters ax equal to 495 and 688 ( x cm-I) and are thus much smaller lhan b; for the axial F&t cenlre., 1660 x IO-' cm-I, which had been studied before. The models of Fe3+ cenues in lithium niobate and lithium tantalate crystals ax "pared and the possible s h u -e and Fei,+,-KE-of the new centres are discussed.
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