The electrical conductivity of 125-, 332-, and 545-μm-thick single crystalline Kyocera alpha alumina has been measured before, during, and after irradiation with 1 MeV electrons in an applied electric field of 300 kV/m at temperatures up to 723 K. Simultaneous measurements of the bulk and surface conductivity to a total fluence of and at 723 K show no bulk and no surface degradation in the specimen, rather than only a sort of decrease of the conductivity with total dpa. Strong thickness dependence of radiation induced conductivity (RIC) is found and is believed to be due to the effect of electron charge deposition and the production of charged point defects during irradiation. Finally it is suggested that the thickness dependent RIC of the insulating materials must be considered carefully before designing the coating and window materials of fusion reactors.
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1 February 2001
Research Article|
February 01 2001
Role of specimen thickness on the electrical conductivity of single crystalline alumina under electron irradiation
M. M. R. Howlader;
M. M. R. Howlader
Department of Nuclear Engineering, Kyushu University 36, Fukuoka 812-8581, Japan
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C. Kinoshita;
C. Kinoshita
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University 36, Fukuoka 812-8581, Japan
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K. Shiiyama;
K. Shiiyama
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University 36, Fukuoka 812-8581, Japan
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T. Higuchi
T. Higuchi
Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University 36, Fukuoka 812-8581, Japan
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J. Appl. Phys. 89, 1612–1618 (2001)
Article history
Received:
May 12 2000
Accepted:
November 03 2000
Citation
M. M. R. Howlader, C. Kinoshita, K. Shiiyama, T. Higuchi; Role of specimen thickness on the electrical conductivity of single crystalline alumina under electron irradiation. J. Appl. Phys. 1 February 2001; 89 (3): 1612–1618. https://doi.org/10.1063/1.1336516
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