Abstract
The comparative study of the internal friction of ZrO2 polycrystals containing 2mol% Y2O3, 8mol% Y2O3 and 12mol% CeO2 (2Y-TZP, 8Y-FSZ and 12Ce-TZP) was performed at high frequencies around 100kHz. The data of 2Y-TZP around 100kHz revealed an anelastic relaxation peak with the activation enthalpy H=82.5±1.4kJ/mol, the relaxation strength Δ=1.34±0.08×10-2, and τ0=5.4±1.1×10-14s. The relaxation is considered to be the same as the dielectric one with H=79.0±3.8kJ/mol and τ0=5.9±3.1×10-13s. The internal friction for 2Y-TZP and 8Y-FSZ indicated the existence of the same relaxation process and consequently the possibility of similar local cation-anion (or vacancy) interaction in Y2O3 doped ZrO2 regardless of the symmetry (tetragonal and cubic). The internal friction was small for the 12Ce-TZP, but was large after the reduction and increased at elevated temperature, accompanied by the trace peak. The results indicate directly significant contribution of the oxygen vacancy to the generation of the internal friction of ZrO2.
