Relaxation Peaks Produced by Defect Complexes in Cerium Dioxide Doped with Trivalent Cations.

摘要

Cerium dioxide doped with Y exp 3+ ions, which is of interest for its ionic conductivity, is here studied by anelastic methods. The internal friction peaks observed are analyzed into peaks A, B, C (with H/sub r/ = 0.64, 0.71 and 0.78 eV, respectively). Peak A, present at low Y exp 3+ concentrations is established to be due to a YV pair (V = oxygen-ion vacancy), which is a charged defect compensated by an isolated Y. Peak B is believed to be due to a Y sub 2 V complex with the Y-Y pair in the (1,0,0) configuration. For this defect, only relaxations involving the V motion are observable, giving an example of the frozen-free split phenomenon. (ERA citation 07:044196)