TY - JOUR
T1 - Effect of Cr2O3 and NiO dopants in α-Al 2O3 on its electrical conductivity under electron irradiation
AU - Shiiyama, K.
AU - Shiraishi, A.
AU - Kutsuwada, M.
AU - Matsumura, S.
AU - Kinoshita, C.
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/8/1
Y1 - 2004/8/1
N2 - The electrical conductivity of single crystals of α-Al 2O3 doped with Cr2O3 (0.03-2.5 wt%), NiO (0.75 wt%) plus Cr2O3 (0.03-0.15 wt%), and NiO (0.75 wt%) has been measured under 1 MeV electron irradiation at 300 K to investigate the effects of the concentration of impurity and of the depth of impurity levels in forbidden bands on the radiation induced conductivity (RIC). The RIC of Cr2O3 and/or NiO doped α-Al2O3 decreases with increasing concentration of Cr2O3 and/or NiO dopants. The electrical conductivity of 2.5 wt% Cr2O3 doped α-Al2O3 is smaller than any other doped materials tested. The dose rate exponent for Cr2O3 doped α-Al2O3 is smaller than that for NiO plus Cr 2O3 doped material, due to deeper trapping centers of Cr (5.8 eV from the conduction band) than those of Ni (2.0 eV). Doping impurities with deep trapping centers are most effective for suppressing RIC.
AB - The electrical conductivity of single crystals of α-Al 2O3 doped with Cr2O3 (0.03-2.5 wt%), NiO (0.75 wt%) plus Cr2O3 (0.03-0.15 wt%), and NiO (0.75 wt%) has been measured under 1 MeV electron irradiation at 300 K to investigate the effects of the concentration of impurity and of the depth of impurity levels in forbidden bands on the radiation induced conductivity (RIC). The RIC of Cr2O3 and/or NiO doped α-Al2O3 decreases with increasing concentration of Cr2O3 and/or NiO dopants. The electrical conductivity of 2.5 wt% Cr2O3 doped α-Al2O3 is smaller than any other doped materials tested. The dose rate exponent for Cr2O3 doped α-Al2O3 is smaller than that for NiO plus Cr 2O3 doped material, due to deeper trapping centers of Cr (5.8 eV from the conduction band) than those of Ni (2.0 eV). Doping impurities with deep trapping centers are most effective for suppressing RIC.
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U2 - 10.1016/j.jnucmat.2004.04.239
DO - 10.1016/j.jnucmat.2004.04.239
M3 - Conference article
AN - SCOPUS:3342989163
SN - 0022-3115
VL - 329-333
SP - 1520
EP - 1523
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3 PART B
T2 - Proceedings of the 11th Conference on Fusion Research
Y2 - 7 December 2003 through 12 December 2003
ER -