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Ag isotope fractionation in a centrifuged $$alpha$$-AgI super-ionic conductor

超遠心後の超イオン伝導体$$alpha$$-AgI中のAg同位体分布

小野 正雄  ; 岡安 悟  ; 井口 裕介*; 江坂 文孝  ; Bagum, R.*; 春木 理恵; 真下 茂*

Ono, Masao; Okayasu, Satoru; Iguchi, Yusuke*; Esaka, Fumitaka; Bagum, R.*; Haruki, Rie; Mashimo, Tsutomu*

超イオン伝導体$$alpha$$-AgIに関して、最大遠心加速度61万G,温度220$$^{circ}$$C,遠心時間100時間の超遠心実験を行った。超遠心後の試料の組成と構造を、それぞれEPMA及び微小領域XRDにて調べたが、実験前後で有意な組成変化は生じておらず、61万Gの遠心加速度場条件下ではAgIの化学量論組成が保たれることがわかった。一方、二次イオン質量分析器(SIMS)を用いて超遠心後の試料断面のAgの同位体存在比分布を調べたところ、重力方向に$$^{109}$$Agが増加し、$$^{107}$$Agは減少する同位体存在比の空間分布変化が確認された。これは、遠心力によってIの副格子中のAgの拡散に方向性が生じ、重い$$^{109}$$Agが重力方向に移動し、チャージバランスが保たれるように逆方向に軽い$$^{107}$$Agが移動したものと考えられる。

The ultracentrifuge experiment was performed on an $$alpha$$-AgI super-ionic conductor at acceleration field of 6.1$$times$$10$$^{5}$$ g at 220$$^{circ}$$C for 100 hours. From the analysis using Electron Probe Micro Analyzer (EPMA) and micro-area X-Ray Diffractometer, it was confirmed that the centrifuged specimen kept its stoichiometry. The isotope ratio measurements were performed on the centrifuged specimen with Secondary Ion Mass Spectrometer (SIMS). $$^{107}$$Ag/$$^{109}$$Ag isotope ratio on the specimen changed with negative gradient in the direction of centrifugal force approximately 1.5%. These observations indicated that the heavy $$^{109}$$Ag isotopes moved in the direction of the centrifugal force and the light $$^{107}$$Ag isotopes moved in the counter direction keeping charge balance in the specimen.

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