High-temperature XAFS measurement of molten salt systems

溶融塩系の高温XAFS測定

岡本 芳浩  ; 赤堀 光雄; 本橋 治彦*; 伊藤 昭憲; 小川 徹

Okamoto, Yoshihiro; Akabori, Mitsuo; Motohashi, Haruhiko*; Ito, Akinori; Ogawa, Toru

希土類塩化物のような空気中で活性な溶融塩系の局所構造を調べるために、最高到達温度1000の高温XAFS測定システムを開発した。砂時計型の石英セルの上部タンクに固体試料を減圧状態でセットし、電気炉で溶融させ、厚さ0.1mm(0.2mm)の融体パスを通過するところで、XAFS測定を実施した。石英の吸収のために、10keV以上のエネルギー領域に測定が限られたが、本測定システムで吸湿性の高い活性な溶融塩系のXAFS測定が可能であることを確認した。

Measurement system for the high temperature XAFS was developed for investigating the local structure of hygroscopic molten salts like rare earth halides. Solid sample was enclosed in the upper tank of the quartz cell having a sandglass shape under reduced pressure to avoid oxygen and moisture. The measurement was carried out at the electric furnace of the highest arrival temperature 1273K. After melting, the sample runs down through the melt path with 0.1mm(or 0.2mm) thickness to the lower tank. The minimum energy which could be measured was about 10keV mainly due to the absorption of the quartz. It was confirmed that the measurement of the expensive hygroscopic sample became possible in the present work.