Dose rate dependence of radiation induced conductivity for hydrogen-doped perovskite ceramics at 473 K

Abstract

Dose rate dependence of radiation induced conductivity (RIC) of hydrogen doped yttrium-doped perovskite-type barium-cerium oxide ceramics (BaCe 0.9Y 0.1O 3−δ) was investigated under 1.8 MeV electron irradiation within dose rate of 10–1000 Gy/s at temperature of 473 K. The RIC in the initial dose for the H-doped BaCe 0.9Y 0.1O 3−δ exponentially increased as a function of dose rate, and eventually became about three orders of magnitude higher than the base conductivity without radiation. For the dose rates below 200 Gy/s, the RIC of the H-doped BaCe 0.9Y 0.1O 3−δ was higher by one order of magnitude than that of the H-undoped one. The results may show that the RIC takes place due to hydrogen diffusion as well as electronic excitation, enhanced by ionizing effects. For the dose rate range 300–1000 Gy/s, the RIC of H-doped BaCe 0.9Y 0.1O 3−δ is similar to that of H-undoped one. The radiation enhanced diffusion of constitutive oxygen dominates for the RIC.