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APPLICABILITY OF THE MASS ACTION LAW IN COMBINATION WITH THE COEXISTENCE THEORY OF METALLIC MELTS INVOLVING COMPOUND TO BINARY METALLIC MELTS

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Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 353-362页

作者： j.zhangmetallurgical engineering school, university of science and technology beijing, beijing 100083, china manuscript received 9 march 2001 in revised form 7 August 2001 Metallurgical engineering school University of Science and Technology Beijing Beijing 100083 China

Based on the atomicity and molecularity as well as the consistency ofthermodynamic properties and activities of metallic melts with their structures, the coexistencetheory of metallic melts structure involving compound has been suggested. According to this theory,the calculating models of mass action concentrations for different binary metallic melts have beenformulated. The calculated mass action concentrations agree well with corresponding measuredactivities, which confirms that the suggested theory can reflect the structural characteristics ofmetallic melts involving compound and that the mass action law is widely applicable to this kind ofmetallic melts.

关键词： metallic melts activity mass action law coexistence theory

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CALCULATION OF THE EXCHANGE INTERACTION CONSTANT BETWEEN RARE-EARTH AND TRANSITION METAL SUBLATTICESIN R_2Fe_(17_x)Al_x(R=Tb, Gd AND Dy)COMPOUNDS

引用

Acta Metallurgica Sinica(English Letters) 2002年第4期15卷 401-404页

作者： Y.M.Hao,C.X.Cui,Y.Gao,W.P.Zhao and j.S.MengDepartment of Physics, Tianjin Normal university, Tianjin 300074, china school of Materials science and engineering, Hebei university of technology, Tianjin 300130, china manuscript received 11 September 2001 in Department of Physics Tianjin Normal University Tianjin 300074 China school of Materials science and engineering Hebei University of Technology Tianjin 300130 China

An approximate calculation of the exchange interaction constant j_(RT)between the rare-earth sublattice and the transition metal sublattice in R_2Fe_(17-x)Al_x (R= Tb,Gd, and Dy) compounds is given by the molecular-field model and the results of neutron *** calculated values, -j_(R,T)/k, for Dy_2Fe_(17-x)Al_x (x=5, 6, 7 and 8), Tb_2Fe_(10)Al_7,Gd_2Fe_(17-x)Al_x (x=7, 8) compounds are 8.62K, 8.64K, 9.52K, 10.34K and 10.66K, 10.65K, and 9.85K,respectively, they are in agreement with the experimental values, -j_(R,T)/k, of Dy_2Fe_(17-x)Al_x(x=5, 6, 7 and 8), Tb_2Fe_(10)Al_7 and Gd_2Fe_(17-x)Al_x (x=7, 8) compounds, which are 8.77K, 9.25K,10.1K, 10.9K and 10.35K, 10.1K, and 10.3K, respectively. The origins of the difference between thecalculated and the experimental results are discussed.

关键词： neutron diffraction magnetic coupling constant molecular-field model two-sublattice model

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