The electrochemical behavior of Dy 3+ on Fe electrode in molten NaCl KCl DyCl 3 has been studied by means of cyclic voltammetry, electrode potential time curve after potentiostatic electrolysis, potential st...The electrochemical behavior of Dy 3+ on Fe electrode in molten NaCl KCl DyCl 3 has been studied by means of cyclic voltammetry, electrode potential time curve after potentiostatic electrolysis, potential step method, and X ray diffraction Experimental results indicate that the Dy Fe alloy forms at first and then the intermetallic compounds of Dy Fe containing more Dy form in sequence The metallic Dy deposits at last The number of intermetallic compounds for Dy Fe system has been determined at 1073 K The standard free energy of formation for (1/2)Dy 2Fe 17 , (1/6)Dy 6Fe 23 , DyFe 3, and DyFe 2 determined are -92 64, 83 10, -76 99, and -59 05 kJ/mol at 1073 K The relationship between diffusion coefficient and temperature of Dy atom in Dy Fe intermetallic compound can be expressed as ln D =-72 9×10 3/ RT -14 7, and the diffusion activation energy is 72 9 kJ/mol The Dy Fe alloy was prepared by consumable cathode in molten chlorides The Dy Fe alloy containing Dy near 90%(wt) was obtained The composition of alloy was DyFe 3 and Dy展开更多
文摘The electrochemical behavior of Dy 3+ on Fe electrode in molten NaCl KCl DyCl 3 has been studied by means of cyclic voltammetry, electrode potential time curve after potentiostatic electrolysis, potential step method, and X ray diffraction Experimental results indicate that the Dy Fe alloy forms at first and then the intermetallic compounds of Dy Fe containing more Dy form in sequence The metallic Dy deposits at last The number of intermetallic compounds for Dy Fe system has been determined at 1073 K The standard free energy of formation for (1/2)Dy 2Fe 17 , (1/6)Dy 6Fe 23 , DyFe 3, and DyFe 2 determined are -92 64, 83 10, -76 99, and -59 05 kJ/mol at 1073 K The relationship between diffusion coefficient and temperature of Dy atom in Dy Fe intermetallic compound can be expressed as ln D =-72 9×10 3/ RT -14 7, and the diffusion activation energy is 72 9 kJ/mol The Dy Fe alloy was prepared by consumable cathode in molten chlorides The Dy Fe alloy containing Dy near 90%(wt) was obtained The composition of alloy was DyFe 3 and Dy
