抄録
Mega-gravity field (strong acceleration field) can realize the sedimentation of even atoms, and is expected to create a nonequilibrium crystal-chemical state in multi-component condensed matter . However, the materials science research in mega-gravity field has now remained as an unprecedented area, although the micro-gravity field has been much used in materials science. We presented a self-consistent theory of the sedimentation of atoms in condensed matter, and developed a ultracentrifuge apparatus to generate a strong acceleration field of over 1 million (1 X 106) g at high temperature . Recently, we , for the first time , succeeded in formation of the atomic concentration distributions caused by sedimentation of component atoms in an alloy. In this article, the effects on atoms, molecule and crystal, and the applications strong acceleration field are discussed on the basis of the theoretical and experimental results . The ultracentrifuge apparatus is described , and the recent mega-gravity field experiment on the Bi- Sb system alloy is shown. It is suggested that the sedimentation of atoms and the instability in molecular or crystalline state under a mega-gravity field will be used as a new materials processing, to control compositions, impurities or isotopes, to form graded structure, and to control micro-structure in solids, etc., in many fields such as metallurgy, semiconductor science, polymer science, solid state chemistry, nucleonics, etc., as well as biochemistry.
