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Sedimentation of substitutional solute atoms in intermetallic compound of Bi-Pb system under ultra-strong gravitational field

超強重力場下におけるBi-Pb系金属間化合物中の置換型溶質原子の沈降

小野 正雄 ; Huang, X.*; 木下 貴博*; 上野 秀人*; 長壁 豊隆 ; 真下 茂

Ono, Masao; Huang, X.*; Kinoshita, Takahiro*; Ueno, Hideto*; Osakabe, Toyotaka; Mashimo, Tsutomu

超強重力場下では、凝縮物質中でさえ原子の沈降が生じる。筆者らはこれまでに幾つかの固溶系合金にて置換型溶質原子の沈降を実現している。それでは、他の合金系ではどうなのか?そこで、本研究では、Bi-Pb系金属間化合物(Bi$$_{3}$$Pb$$_{7}$$)について、実験時間の条件を変えながら超重力場実験を行った。(実験条件:最大加速度1.0$$times$$10$$^{6}$$gレベル,温度:130-150$$^{circ}$$C,実験時間:30-150h,状態:固体)。実験後の試料には組成変化が見られた。また、出発状態ではBi$$_{3}$$Pb$$_{7}$$であったが、実験後には重力が弱い側にBi相が出現していることがわかった。これらの結果は金属間化合物中でも原子の沈降が起こり、組成変化と構造の変化が起きたことを表している。

Ultra-strong gravitational field can induce sedimentation of even atoms in condensed matter. We had realized sedimentation of substitutional solute atoms in some miscible alloys. How about in the other alloys? So, In this study, the ultra-centrifuge experiments were performed on an intermetallic compound of Bi-Pb system (Bi$$_{3}$$Pb$$_{7}$$) by changing time duration of experiment time (experimental conditions; maximum centrifugal force: 1.0$$times$$10$$^{6}$$g level, temperature: 130-150 $$^{circ}$$C, duration: 30-150h, state: solid). Composition changes were observed in the centrifuged samples. And, it was found that the Bi phase appeared from starting state of Bi$$_{3}$$Pb$$_{7}$$ around the weak gravitational field region of the sample. These results showed that sedimentation of substitutional solute atoms occurred, and induced the structure change in intermetallic compounds.

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