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[en] Macroscopic length (linear swelling) and thermal diffusivity changes were measured for heavily neutron-irradiated α-Al2O3, AlN, β-Si3N4 and β-SiC that were irradiated under the same capsule to compare the difference between these materials. And in addition, several capsules were irradiated under different temperatures (646-1039 K) and to different neutron doses (0.4-8.0x1026 n/m2) in the Japanese experimental fast reactor JOYO. The swelling and the thermal diffusivity of as-irradiated specimens showed some dependence on the neutron-irradiation dose and the irradiation temperature, and that indicates stability under neutron-irradiation environments. Alpha-Al2O3 and AlN showed relatively large swelling and degradation of thermal diffusivity than β-Si3N4 and β-SiC. This difference is related to the crystal structure of each material. The dependence of swelling on irradiation dose, that is, α-Al2O3 showed linear inclination but β-Si3N4 and β-SiC showed saturation, supports the model of defect structures. In addition, annealing behaviors of swelling and thermal diffusivity were compared to analyze the behavior of defects at higher temperature. (author)
Source
Beynon, T.D. (ed.) (School of Physics and Astronomy, Univ. of Birmingham, Birmingham (United Kingdom)); Dudziak, D.J. (ed.) (US); Yano, Toyohiko; Iio, Shunji (Tokyo Inst. of Technology, Tokyo (JP)) (eds.); 727 p; ISBN 978-4-903054-15-5; 
; Mar 2008; p. 567-574; INES-2: 2. COE-INES international symposium; Yokohama, Kanagawa (Japan); 26-30 Nov 2006; 16 refs., 6 figs., 2 tabs.
; Mar 2008; p. 567-574; INES-2: 2. COE-INES international symposium; Yokohama, Kanagawa (Japan); 26-30 Nov 2006; 16 refs., 6 figs., 2 tabs.