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The complex elastic compliance s11(w,T) of SrTiO3-d has been measured as afunction of the O deficiency d < 0.01. The two main relaxation peaks in theabsorption are identified with hopping of isolated O vacancies over a barrierof 0.60 eV and reorientation of pairs of vacancies involving a barrier of 1 eV.The pair binding energy is ~0.2 eV and indications for additional clustering,possibly into chains, is found already at d ~0.004. The anistropic component ofthe elastic dipole of an O vacancy is Deltalambda = 0.026.

Hopping and clustering of oxygen vacancies in SrTiO3 by anelastic relaxation