Quick scan XAFS study of high-temperature molten salts

Okamoto, Yoshihiro  ; Shiwaku, Hideaki   ; Numakura, Masahiko; Kobayashi, Toru ; Akutsu, Kazuhiro; Yaita, Tsuyoshi; Suzuki, Shinichi

We have studied peculiar behaviors of lanthanide ion in molten chlorides by using high-energy XAFS measurement techniques in the SPring-8. The sample is usually used under static condition in the measurement, since it is sealed off in a quartz cell under reduced pressure. However, there are many reactions in the pyrochemistry of spent nuclear fuels. In the present study, we tried to obtain a XAFS pattern in a few minutes using the Quick scan XAFS (QXAFS) technique developed in the BL11XU, SPring-8. In the QXAFS measurement, a XAFS spectrum of the La K-absorption edge of molten salts were obtained in 5 minutes. It is far shorter than 30-60 minutes in the normal step-scan XAFS measurement. According to the data analysis, it was clarified that the QXAFS data can be used enough to observe molten salt reactions.