Optical spectroscopy study of modifications induced in cerium dioxide by electron and ion irradiations

Jean Marc Costantini, Gaëlle Gutierrez, Hideo Watanabe, Kazuhiro Yasuda, Seiya Takaki, Gérald Lelong, Maxime Guillaumet, William J. Weber

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

UV-visible absorption spectroscopy and Raman spectroscopy were used to study damage production in cerium dioxide epitaxial films and polycrystalline sintered samples after irradiation with electrons for three energies to span the threshold displacement energies of cerium and oxygen atoms, and 2.4-MeV Cu ions. Neither amorphization nor specific colour-centre bands were detected. Evolutions of the refractive index were derived from the interference fringes in the optical transmission spectra of epilayers after irradiation. No significant change of the refractive index occurred for the 1.0-MeV electron irradiation, whereas a maximum decrease by 28 ± 8% was deduced for the 1.4-MeV and 2.5-MeV energies. These modifications are consistent with ballistic damage on the cerium sublattice for high electron energies producing Ce3+ ions. However, no significant change of refractive index was found for the Cu ion irradiation. This likely stems from the high rate of Frenkel pair recombination in the collision cascades induced by more energetic recoils than for the electron irradiations, combined with electronic excitations and hole capture on Ce3+ ions. This study reveals modifications of the electronic structure upon irradiation that could take place in other non-amorphizable oxide systems.

Original languageEnglish
Pages (from-to)1695-1714
Number of pages20
JournalPhilosophical Magazine
Volume99
Issue number14
DOIs
Publication statusPublished - Jul 18 2019

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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