On-line optical absorption of electron-irradiated yttria-stabilized zirconia - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue Journal of Physics and Chemistry of Solids Année : 2022

On-line optical absorption of electron-irradiated yttria-stabilized zirconia

Résumé

The kinetics of color-center formation and decay in electron-irradiated cubic yttria-stabilized zirconia (ZrO$_2$: Y$^{3+}$) is followed by on-line UV-visible absorption spectroscopy. Growth and time decay of absorption spectra was measured upon electron irradiation and subsequent beam shut-off for energies of 0.8, 1.0, 1.75, and 2.5 MeV. For a high beam current intensity, spectra are fitted by two broad absorption bands centered at 3.0 eV and 3.8 eV. Such bands are assigned to the so-called T-center, i. e. Zr$^{3+}$ ions in a trigonal point symmetry, which is produced by ionization processes either by photon irradiation or charged particle irradiation. A red-shift of absorption spectra is observed for lower current intensities regardless of electron energy. Such a modification is attributed to a change in the local environment of Zr$^{3+}$ ions due to the formation of neighboring oxygen vacancies by elastic collisions, depending on the electron energy and enhanced by a higher flux. A common behavior of increase of the differential absorbance to similar saturation values after accumulation of the irradiation dose and time-decays to similar non-zero asymptotic values are observed, regardless of the electron energy. However, the rise time and lifetime deduced from growth and decay curves of the absorbance are depending on the electron energy. The increase and saturation of the T-center growth rate with electron energy is attributed to competitive channels of hole trapping on the oxygen and zirconium vacancies induced by elastic collisions. The present on-line experiments reveal the complex process of point-defect generation resulting from the interplay of displacement damage and electronic excitations.
Fichier principal
Vignette du fichier
ON-LINE OPTICAL ABSORPTION YSZ.pdf (2.6 Mo) Télécharger le fichier

Dates et versions

cea-04151157 , version 1 (04-07-2023)

Identifiants

  • HAL Id : cea-04151157 , version 1

Citer

Jean-Marc Costantini, Olivier Cavani, Bruno Boizot. On-line optical absorption of electron-irradiated yttria-stabilized zirconia. Journal of Physics and Chemistry of Solids, 2022, 169, pp.110853. ⟨cea-04151157⟩
17 Consultations
41 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More