科研之友
微信
新浪微博
Facebook
分享链接
摘要
We have studied the effect of yttria content on the recovery of paramagnetic centres in electron- and ion-irradiated yttria-stabilized zirconia (ZrO2: Y3+). Single crystals with 9.5 or 18 mol% Y2O3 were irradiated with 1.0-2.5 MeV electrons, 145-MeV carbon ions, 200-MeV iodine ions, 1.45-GeV xenon ions and 2.25-GeV gold ions at various fluences. Thermal annealing of electron (F+-type and T) centres and hole centres was studied by X-band electron paramagnetic resonance spectroscopy. Hole centres are found to anneal more quickly for 18 mol% than for 9.5 mol% Y2O3. At long annealing times, a non-zero asymptotic behaviour is observed in the isothermal annealing curves of hole centres and F+-type centres between 300 and 500 K. For the electron-irradiated samples, the asymptotic concentration of both defect types normalized by the values prior to annealing has a maximum value of similar to 0.5 for annealing temperatures below the onset of the (isochronal) recovery stage (400 K), regardless of the yttria content. For the ion-irradiated samples, larger normalized asymptotic values (similar to 0.8) at high annealing temperature are found for the F+-type centres with a similar recovery process. Such an uncommon behaviour is analysed on the basis of a model using equilibrated reactions between point defects with different charge states.
- 出版日期2014
- 单位中国地震局
