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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.48  No.9 (2007)  >  pp.2285-2288

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Faceted Crystal Growth of Silicon from Undercooled Melt of Si-20 mass%Ni Alloy

Tsukasa Takazawa1), Minoru Ikeda1) and Toshio Suzuki1)
1) Department of Materials Engineering, The University of Tokyo

Two-dimensional faceted crystal growth of silicon from undercooled melt of Si-20 mass%Ni alloy was experimentally investigated, in which a droplet sample from 10 to 100 mg was undercooled on a single-crystal sapphire and growing crystals were observed in situ. Observed crystals were classified according to the shapes of square, wedge and irregular shapes. The growth velocity was measured for different undercooling conditions. The growth velocity of square shaped crystals was about half times smaller than that of wedge shaped crystals. The growth of square shaped crystals is regarded to be two-dimensional and it is compared with the results of two-dimensional phase-field simulations. Growth velocity in both is in good agreement and the linear kinetic coefficient is estimated to be 0.002 m/sK.

faceted crystal growth, silicon, undercooling, phase-field models

Received: February 27, 2007
Accepted: May 14, 2007 , Published online: August 25, 2007
Copyright (c) 2007 The Japan Institute of Metals



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