The chemical diffusion of O, and the structure of electronic defects in undoped and transition metal doped monocrystals were investigated by using a contact-free relaxation technique and magneto-optical resonance methods. The local structure and transport properties of 9.5mol% Y2O3-stabilized material were related to the precise distribution of 7-fold and 6-fold coordinated Zr defects, with trigonal symmetry, which gave rise to conduction band-tail states and acted as electron traps. A marked interaction between ionic and electronic transport properties could be quantitatively explained in terms of a modified ambipolar transport model. In experimental studies, the O diffusion could be precisely monitored by using the optical relaxation technique.

N.Nicoloso, J.Maier, F.K.Koschnick, J.M.Spaeth: Radiation Effects and Defects in Solids, 1995, 137[1-4], 259-65