Title: The distribution coefficients of admixtures in gadolinium

Authors: L. Kuchar Jr., L. Kuchar, J. Drapala, G.S. Burchanov, O.D. Czistjakov

Addresses: Laboratory of Metallurgy, Helsinki University of Technology, 02150 Espoo, Finland. ' Faculty of Metallurgy and Material Engineering, Technical University of Mining and Metallurgy, tr.l7.listopadu, Ostrava, 70833, Czech Republic. ' University of Mining and Metallurgy, tr.l7.listopadu, Ostrava, 70833, Czech Republic. ' Bajkov Institute of Metallurgy, Academy of Science, Moscow, Russia. ' Bajkov Institute of Metallurgy, Academy of Science, Moscow, Russia

Abstract: This paper gives calculation of solidus and liquidus curves in binary systems for the base metal versus impurities in a range near to the pure metal gadolinium. From these solidus and liquidus curves you determine the equilibrium distribution coefficients k0 = XS/XL for all known impurities in gadolinium. The equilibrium distribution coefficients depending on temperature allows us to construct the relationship between k0 and atomic number, which makes it possible to predict the distribution coefficient value of impurities for which the binary system was unknown. These calculated coefficients were confirmed by experimental melting of binary systems. The experimental value of distribution coefficient in the system gadolinium-dysprosium are in a good agreement with calculated values.

Keywords: gadolinium; distribution coefficient; refining; zone melting; dysprosium; equilibrium distribution.

DOI: 10.1504/IJMPT.1994.036426

International Journal of Materials and Product Technology, 1994 Vol.9 No.4/5/6, pp.323 - 330

Published online: 03 Nov 2010 *

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