Abstract
Polycrystalline MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} have been irradiated with 18 MeV protons at temperatures from 200-500 C while maintained in an electric field of 500 kV/m. Permanent increases in the d.c. conductivity occurred when the irradiation temperature exceeded 300 C for MgAl{sub 2}O{sub 4} and 400 C for Al{sub 2}O{sub 3} after an incubation dose that varied with both material and irradiation temperature. In the case of MgAl{sub 2}O{sub 4} irradiation below 300 C and subsequent heating to 600 C also produced large increases in conductivity. Under extreme conditions the conductivity of both MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} increased to {approx}10{sup -4} {Omega}{sup -1}m{sup -1} at which point the materials can no longer be regarded as good insulators. The damage dose required to produce severe degradation of the insulators is {approx}10{sup -3} dpa which would have severe consequences for ceramic insulated copper magnet coils located within the shield of a fusion power reactor. (author).
Pells, G P
[1]
- AEA Reactor Services, Harwell (United Kingdom)
Citation Formats
Pells, G P.
Radiation-induced degradation of the electrical conductivity of MgAl{sub 2}O{sub 2} and Al{sub 2}O{sub 3}.
United Kingdom: N. p.,
1990.
Web.
Pells, G P.
Radiation-induced degradation of the electrical conductivity of MgAl{sub 2}O{sub 2} and Al{sub 2}O{sub 3}.
United Kingdom.
Pells, G P.
1990.
"Radiation-induced degradation of the electrical conductivity of MgAl{sub 2}O{sub 2} and Al{sub 2}O{sub 3}."
United Kingdom.
@misc{etde_10142435,
title = {Radiation-induced degradation of the electrical conductivity of MgAl{sub 2}O{sub 2} and Al{sub 2}O{sub 3}}
author = {Pells, G P}
abstractNote = {Polycrystalline MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} have been irradiated with 18 MeV protons at temperatures from 200-500 C while maintained in an electric field of 500 kV/m. Permanent increases in the d.c. conductivity occurred when the irradiation temperature exceeded 300 C for MgAl{sub 2}O{sub 4} and 400 C for Al{sub 2}O{sub 3} after an incubation dose that varied with both material and irradiation temperature. In the case of MgAl{sub 2}O{sub 4} irradiation below 300 C and subsequent heating to 600 C also produced large increases in conductivity. Under extreme conditions the conductivity of both MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} increased to {approx}10{sup -4} {Omega}{sup -1}m{sup -1} at which point the materials can no longer be regarded as good insulators. The damage dose required to produce severe degradation of the insulators is {approx}10{sup -3} dpa which would have severe consequences for ceramic insulated copper magnet coils located within the shield of a fusion power reactor. (author).}
place = {United Kingdom}
year = {1990}
month = {Dec}
}
title = {Radiation-induced degradation of the electrical conductivity of MgAl{sub 2}O{sub 2} and Al{sub 2}O{sub 3}}
author = {Pells, G P}
abstractNote = {Polycrystalline MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} have been irradiated with 18 MeV protons at temperatures from 200-500 C while maintained in an electric field of 500 kV/m. Permanent increases in the d.c. conductivity occurred when the irradiation temperature exceeded 300 C for MgAl{sub 2}O{sub 4} and 400 C for Al{sub 2}O{sub 3} after an incubation dose that varied with both material and irradiation temperature. In the case of MgAl{sub 2}O{sub 4} irradiation below 300 C and subsequent heating to 600 C also produced large increases in conductivity. Under extreme conditions the conductivity of both MgAl{sub 2}O{sub 4} and Al{sub 2}O{sub 3} increased to {approx}10{sup -4} {Omega}{sup -1}m{sup -1} at which point the materials can no longer be regarded as good insulators. The damage dose required to produce severe degradation of the insulators is {approx}10{sup -3} dpa which would have severe consequences for ceramic insulated copper magnet coils located within the shield of a fusion power reactor. (author).}
place = {United Kingdom}
year = {1990}
month = {Dec}
}