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Significance of sample thickness and surface segregation on the electrical conductivity of Wesgo AL995 alumina under ITER environments by M.M.R Howlader; Chiken Kinoshita; K Shiiyama; M Kutsuwada; T Higuchi is a Materials Science article available to read on EtoBox.

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The electrical conductivity of 158, 295 and 610 lm thick Wesgo AL995 alumina was measured under 1 MeV electron irradiation with an electric ®eld of 300 kV/m at temperatures up to 723 K. A signi®cant increase in the conductivity with increasing the sample thickness is con®rmed, but no substantial bulk degradation is found under irradiation up to a dose of 7X0 Â 10 22 eam 2 7X97 Â 10 À5 dpa at 723 K. However, surface breakdown is found only in 295 and 610 lm thick specimens. The non-existence of the surface breakdown in 158 lm thick specimen is thought to be due to the sinks eect of point defects at the surface. The X-ray analysis of the virgin and degraded specimens through scanning electron microscopy (SEM) reveals the segregation of impurities along the grain boundaries on the degraded surface. The segregation of impurities assists leaking of surface current along the grain boundaries.

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Author

M.M.R Howlader; Chiken Kinoshita; K Shiiyama; M Kutsuwada; T Higuchi

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0022-3115)

Published

2000

Language

EN

Field

Materials Science (Physical Sciences)