Immobilization of strontium, cesium and rhenium into α-SiAlON ceramics assisted with co-doping of yttrium(<Feature>SiAlons and Non-oxides)
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概要
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Immobilization of long-lived fission products (LLFP) such as radioactive Tc, Cs and Sr into α-SiAlON ceramics was evaluated using stable isotopes instead of radioactive isotopes, and the applicability of α-SiAlON ceramics as the inert matrix for transmutation of LLFP was investigated. In the case of single addition of SrO, SrCO_3, Cs_2CO_3 or ReO_2 to the starting materials, α-SiAlON single phase was not formed after hot-pressing. When Y_2O_3 was added with SrO, SrCO_3 or Cs_2CO_3 to the starting materials (α-Si_3N_4, AlN and α-Al_2O_3) in optimum compositions, α-SiAlON single phase was obtained after hot-pressing at 1700℃ or 1800℃. From the EDS analysis, Sr and Y were detected from grains. It is suggested that Y would assist the expansion of interstices of α-SiAlON lattice, resulting in the incorporation of Sr^<2+> into α-SiAlON lattice. In the case of Cs addition with Y, Cs was not incorporated into interstices due to much larger ionic radius of Cs^+. Bulk density of hot-pressed α-SiAlON ceramics obtained in this study was higher values and densification proceeded well. From these results, it was found that the immobilization of Sr in α-SiAl0N was successfully achieved with co-doping of Y, and α-SiAlON ceramics would be an inert matrix for transmutation of long-lived radioactive Sr.
- 2008-06-01
著者
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Yoshida Katsumi
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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IMAI Masamitsu
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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YANO Toyohiko
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology
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Yoshida Katsumi
Res. Lab. For Nuclear Reactors Tokyo Inst. Of Technol.
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Yano Toyohiko
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Imai Masamitsu
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Matsunaga Toshihiro
Research Laboratory For Nuclear Reactors Tokyo Institute Of Technology
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Yano Toyohiko
Tokyo Inst. Of Technol. Res. Lab. For Nuclear Reactors
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