Author： Tsatomu Mashimo
Publisher： Taylor & Francis Ltd
ISSN： 1362-3036
Source： Philosophical Magazine Letters, Vol.83, Iss.11, 2003-11, pp. : 687-690
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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 
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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