Hopping and clustering of oxygen vacancies in SrTiO3 by anelastic relaxation

Details Hopping and clustering of oxygen vacancies in SrTiO3 by anelastic relaxation Hopping and clustering of oxygen vacancies in SrTiO3 by anelastic relaxation

2007-07-04

arxiv.org/abs/0707.0639v1

Phys. Rev. B 76, 172106 (2007)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.76.172106

The complex elastic compliance s11(w,T) of SrTiO3-d has been measured as a function of the O deficiency d < 0.01. The two main relaxation peaks in the absorption are identified with hopping of isolated O vacancies over a barrier of 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 of the elastic dipole of an O vacancy is Deltalambda = 0.026.

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