Volume 81, Number 5, March 2008
|Number of page(s)||4|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||19 February 2008|
Gravity-induced diffusion of isotope atoms in monoatomic solid Se
Shock Wave and Condensed Matter Research Center, Kumamoto University - Kurokami-cho, Kumamoto 860-8555, Japan
2 Advanced Science Research Center, Japan Atomic Energy Agency - Tokai-mura, Nakagun, Ibaraki 319-1195, Japan
3 Institute for Study of the Earth's Interior, Okayama University - Misasa-cho, Tottri 682-0193, Japan
Accepted: 9 January 2008
A strong gravitational field resulted in the gravity-induced diffusion (sedimentation) of isotope atoms in monoatomic solid Se. The layer crystalline morphology consisting of three zones of the fine-grained crystals, the long crystals and feather-shaped crystals grown parallel to gravity direction appeared in the specimen ultracentrifuged at (0.8-1)106 G and at 190 °C. Change in the concentration ratio 82Se/76Se of > 0.8% was observed in the grown crystalline region. These results show an evidence for the sedimentation of substitutional atoms in solids via self-diffusion, and suggest the possibility of application to the control of impurity and crystalline states as well as to isotope separation.
PACS: 67.80.dj – Defects, impurities, and diffusion / 47.57.ef – Sedimentation and migration / 66.30.Fq – Self diffusion in metals, semimetals, and alloys
© EPLA, 2008
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