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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 323-325Atomic-Scale Materials Processing under Strong...

Atomic-Scale Materials Processing under Strong Gravitational Field

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Abstract:

A strong gravitational field causes the changes in composition and structure through sedimentation or displacement of atoms in multi-component condensed matter. We have developed a high-temperature ultracentrifuge to generate a strong acceleration field of even over 1 million (1x10⁶) G, and, for the first time succeeded in realizing the sedimentation of the constitutive solute atoms and aeven isotope atoms in solids or liquids. The changes in composition and crystalline state of various alloys, polymers, and other substances have been investigated. Recently, we started the experiments on compounds and semiconductors with the aims of new materials synthesis and semiconductor control. The chemical reaction, crystal structure change have been found for metallic compound (Bi₃Pb₇), or covalent compounds (Y₁Ba₂Cu₃O_7-x, TiO₂, etc.). The impurity control was also examined in semiconductor. In this article, the recent progress and the future prospects for materials processing are described.

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Diffusion in Materials - DIMAT 2011

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Periodical:

Defect and Diffusion Forum (Volumes 323-325)

Pages:

517-522

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.323-325.517

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Online since:

April 2012

Authors:

Tsutomo Mashimo

Keywords:

Impurity Control, Materials Processing, Sedimentation of Atoms, Strong Gravitational Field, Structure Change

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