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

Journal Article · · Philosophical Magazine (2003, Print)
 [1];  [1];  [2];  [2];  [3];  [4];  [4]; ORCiD logo [5]
  1. Univ. Paris-Saclay, Gif-sur-Yvette (France)
  2. Kyushu Univ., Fukuoka (Japan)
  3. Japan Atomic Energy Agency (JAEA), Tokai (Japan)
  4. Sorbonne Univ., Paris (France)
  5. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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. Yet, no significant change of refractive index was found for the Cu ion irradiation. This likely originates 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.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; French EMIR network
Grant/Contract Number:
AC05-00OR22725; JP16K06961
OSTI ID:
1523729
Journal Information:
Philosophical Magazine (2003, Print), Vol. 99, Issue 14; ISSN 1478-6435
Publisher:
Taylor & FrancisCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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