Radiation damage in ion-irradiated CeO2 and (Ce, Gd)O2 sinters: Effect of the Gd content

Study of the Influence of Doping Efficiency of CeO2 Ceramics with a Stabilizing Additive Y2O3 on Changes in the Strength and Thermophysical Parameters of Ceramics under High-Temperature Irradiation with Heavy Ions

“…In the case of unstabilized CeO2 ceramics, an elevation in the irradiation temperature from 700 to 1000 K leads to a sharp increase in thermal losses and a decrease in thermal conductivity at high irradiation fluences (above 10 13 ion/cm 2 ), which is due to the effects of disordering and swelling of the crystal lattice [14,30,31]. The decrease in thermal conductivity for irradiated samples due to their dielectric nature is due to the creation of In the case of unstabilized CeO 2 ceramics, an elevation in the irradiation temperature from 700 to 1000 K leads to a sharp increase in thermal losses and a decrease in thermal conductivity at high irradiation fluences (above 10 13 ion/cm 2 ), which is due to the effects of disordering and swelling of the crystal lattice [14,16,30]. The decrease in thermal conductivity for irradiated samples due to their dielectric nature is due to the creation of barrier obstacles in the path of phonons, which are the main heat carriers in ceramics.…”

“…As is known, cerium dioxide (CeO 2 ) is often used in ceramic materials due to its excellent properties such as high chemical stability, high density, and thermal conductivity. In the context of nuclear power, these properties make it potentially suitable for use as an inert matrix of dispersed nuclear fuel, which consists of small particles of nuclear material (for example, uranium or plutonium oxide) dispersed in an inert matrix [16][17][18]. This helps to increase the safety of nuclear fuel, since the matrix helps prevent diffusion of radioactive products and heat release into the environment.…”

Raman spectroscopy study of damage in swift heavy ion‐irradiated ceramics

“…[ 25 ] This yields a probed depth of d = 1/ α ~ 3.6 mm, for 63% attenuation of the scattered light, which means that the whole sample thickness was probed in that case. The difference in probed depths for the photon energy of ħω = 2.33 eV lies in the difference in optical gap of ~4.2 eV [ 25 ] and ~3.2 eV, [ 19,22 ] respectively, and Urbach edge for YSZ and CeO 2 . The estimate of the probed depth by Raman spectroscopy in CeO 2 is marked by a vertical line in the depth profiles (Figure 1).…”

“…Similar diffuse UV–visible reflectivity measurements were already carried out on CeO 2 sintered samples. [ 22 ]…”

“…[21] X-ray diffraction data on those CeO 2 and ZrN sintered samples were published elsewhere. [21,22] Samples were polished on one side. Irradiations were applied on the polished sides near room temperature (RT) with 100-MeV 131 Xe for ZrN and 200-MeV 131 Xe for CeO 2 at the Tokai Tandem accelerator (JAEA Ibaraki, Japan) up to fluences of 1 Â 10 12 cm À2 and 1 Â 10 14 cm À2 , respectively, with a flux of $10 9 cm À2 s À1 .…”