2mol%Y_2O_3,8mol%Y_2O_3及び12mol%CeO_2を添加したZrO_2多結晶体の内部摩擦と擬弾性緩和

概要

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The comparative study of the internal friction of ZrO_2 polycrystals containing 2 mol% Y2O_3, 8 mol% Y_2O_3 and 12 mol% CeO_2 (2Y-TZP, 8Y-FSZ and 12Ce-TZP) was performed at high frequencies around 100 kHz. The data of 2Y-TZP around 100 kHZ revealed an anelastic relaxation peak with the activation enthalpy H = 82.5±1.4 kJ/mol, the relaxation strength Δ= 1.34±0.08 x 10^<-2>, and τ_0 = 5.4±1.1 x 10^<-14>s. The relaxation is considered to be the same as the dielectric one with H = 79.0±3.8 kJ/mol and τ_0 = 5.9±3.1x10^<-13>s. 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 Y_2O_3 doped ZrO_2 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 ZrO_2.
社団法人日本セラミックス協会の論文
1991-08-01