Defects in yttria-stabilized zirconia induced by irradiation of ultraviolet photons

Takaaki Morimoto, Masayuki Takase, Toshihide Ito, Hiromitsu Kato, Yoshimichi Ohki

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

When single-crystal yttria-stabilized zirconia samples are exposed to ultraviolet photons with an energy higher than 4.0 eV, three paramagnetic centers are observed at g = 2.006, 1.97-1.95, and 1.91-1.86. With irradiation by ultraviolet photons, an absorption band and a photoluminescence (PL) band are also induced, showing respective peak energies at around 3.3 and 2.8 eV. The onset of the PL-excitation spectrum occurs around 4.0 eV. The induced absorption band and paramagnetic centers disappear with thermal annealing. By doing a numerical analysis on the experimentally obtained angular dependence of the signal at g = 1.91-1.86, it is determined that signals at g = 2.006 and 1.91-1.86 are due to the F+ center and the T center, respectively, and that the signal at g = 1.97-1.95 has some origin other than the two ESR centers. Since two ESR signals at g = 2.006 and 1.97-1.95, the 3.3-eV absorption, and the 2.8-eV PL have the same onset energy at around 4.0eV, the reactions that induce them are triggered by electrons excited into the conduction band tail.

Original languageEnglish
Pages (from-to)6858-6862
Number of pages5
JournalJapanese journal of applied physics
Volume47
Issue number8 PART 3
DOIs
Publication statusPublished - 2008 Aug 22

Keywords

  • Absorption
  • Anisotropy
  • EPR
  • ESR
  • Luminescence
  • Photoluminescence
  • Thermal annealing
  • Ultraviolet photon
  • YSZ
  • Zirconia

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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