Anelastic relaxation experiments (2 to 30kHz) were performed on SrTiO3 ceramics subjected to reduction in H2 atmosphere to yield a balance between O-vacancy and (OH)− defects. The resultant anelastic spectrum contained, in addition to well-known structural transformation near to 110K, several thermally activated relaxation processes between 200 and 700K. The 2 main elastic energy loss peaks were suggested to constitute the first measurements of the hopping-rate of O-vacancy and (OH)− defects in pure SrTiO3.

Anelastic Relaxation in SrTiO3 with O Vacancies and H. F.Cordero, A.Franco, V.R.Calderone, P.Nanni, V.Buscaglia: Materials Science and Engineering: A, 2006, 442[1-2], 55-8