Sedimentation of substitutional atoms and phase change in an In-Pb alloy under an ultrastrong gravitational field |
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| Authors: | Tsatomu Mashimo Masao Ono Takahiro Kinoshita Xinsheng Huang Toyotaka Osakabe Hiroshi Yasuoka |
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| Affiliation: | 1. Advanced Science Research Center , Japan Atomic Energy Research Institute , Tokai-mura, Nakagun, Ibaraki 319-1195, Japan;2. Shock Wave and Condensed Matter Research Center , Kumamoto University , Kumamoto 860-8555, Japan;3. Shock Wave and Condensed Matter Research Center , Kumamoto University , Kumamoto 860-8555, Japan;4. Advanced Science Research Center , Japan Atomic Energy Research Institute , Tokai-mura, Nakagun, Ibaraki 319-1195, Japan |
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| Abstract: | It was found that an atomic-scale graded structure was formed, and a phase change occurred, in an In–Pb alloy by the sedimentation of substitutional solute atoms under an ultrastrong gravitational field (820?000?g (maximum); 150°C; 100?h). Continuous gradients in the concentration of Pb (from about 6 to 45?at.%) and In (from about 94 to 55?at.%) and resulting changes in the lattice constant were observed. Fcc (Pb-rich) and tetragonal (In-rich) phases appeared in the strong- and weak-gravity regions respectively from a single starting fct α phase. It is suggested that sedimentation of substitutional atoms can be used to control the compositions and structure of bulk materials and also thin films or layer interfaces. |
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