The cyclic voltammetry,electrode potential-time curve after potentiostatic electrolysis,potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy￣(3+) in equimolar NaCl-KCl mix...The cyclic voltammetry,electrode potential-time curve after potentiostatic electrolysis,potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy￣(3+) in equimolar NaCl-KCl mixture on Ni electrode.The DyNi5 forms at first and then the intermetallic compounds of Dy-Ni containing more Dy form in sequence.The metallic Dy deposits at last.The Dy-Ni alloy was prepared by consumable cathode in molten chlorides.The Dy-Ni alloy contained Dy over 85 wt% was obtained.The composition of alloy was DyNi5 and Dy.The current efficiency and the recovery of Dy were near 80%.展开更多
The cyclic voltammetry, electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy (III) in NaCl-KCl equimolar m...The cyclic voltammetry, electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy (III) in NaCl-KCl equimolar mixture on Ni electrode. The DyNi5 forms at first and then the intermetallic compounds of DyNi containing more Dy form in sequence. The metallic Dy deposits at last. The standard free energy of formation for DyNi5 determined is -125.6 kJ/mol at 973K. The diffusion coefficient of Dy into DyNi5 phase determined is 8×0-10 cm2/s at 1032 K. The diffusion activation energy of Dy atoms in its intermetallic compound is 101.3 kJ/mol at 973K.展开更多
The cyclic voltammetry, potentialtime curve after potentiostatic electrolysis, potential-step methodand X-ray diffraction were used to study the electrochemical reaction of dysprosium (Ⅲ) in NaCl-KClequimolar mixture...The cyclic voltammetry, potentialtime curve after potentiostatic electrolysis, potential-step methodand X-ray diffraction were used to study the electrochemical reaction of dysprosium (Ⅲ) in NaCl-KClequimolar mixture on cobalt electrode. The Dy-Co alloys form at first and then the intermetallic compoundsof Dy-Co containing more dysprosium form in sequence. The metallic dysprosium deposits at last. Thenumber of Dy-Co alloy was tested. The standard free energies of formation of Dy_2Co_(17), Dy_2Co_7, DyCo_3were calculated to be -60. 8, -34. 6 and -34 . 2 kJ·mol￣(-1), respectively, at 1073 K. The relationshipbetween diffusion coefficient and temperature of dysprosium atom in Dy_2Co_917) alloy phase can be expressedas InD = 124. 7 × 10￣3/RT-7. 9, the diffusion activation energy is 124. 7 kJ· mol￣(-1) . The Dy-Co alloywas prepared by consumable cathode in molten chlorides. The Dy-Co alloy contained dysprosium over 95wt% was obtained. The composition of alloy was DyCo_3 and dysprosium.展开更多
文摘The cyclic voltammetry,electrode potential-time curve after potentiostatic electrolysis,potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy￣(3+) in equimolar NaCl-KCl mixture on Ni electrode.The DyNi5 forms at first and then the intermetallic compounds of Dy-Ni containing more Dy form in sequence.The metallic Dy deposits at last.The Dy-Ni alloy was prepared by consumable cathode in molten chlorides.The Dy-Ni alloy contained Dy over 85 wt% was obtained.The composition of alloy was DyNi5 and Dy.The current efficiency and the recovery of Dy were near 80%.
文摘The cyclic voltammetry, electrode potential-time curve after potentiostatic electrolysis, potential-step method and X-ray diffraction were used to study the electrochemical reaction of Dy (III) in NaCl-KCl equimolar mixture on Ni electrode. The DyNi5 forms at first and then the intermetallic compounds of DyNi containing more Dy form in sequence. The metallic Dy deposits at last. The standard free energy of formation for DyNi5 determined is -125.6 kJ/mol at 973K. The diffusion coefficient of Dy into DyNi5 phase determined is 8×0-10 cm2/s at 1032 K. The diffusion activation energy of Dy atoms in its intermetallic compound is 101.3 kJ/mol at 973K.
文摘The cyclic voltammetry, potentialtime curve after potentiostatic electrolysis, potential-step methodand X-ray diffraction were used to study the electrochemical reaction of dysprosium (Ⅲ) in NaCl-KClequimolar mixture on cobalt electrode. The Dy-Co alloys form at first and then the intermetallic compoundsof Dy-Co containing more dysprosium form in sequence. The metallic dysprosium deposits at last. Thenumber of Dy-Co alloy was tested. The standard free energies of formation of Dy_2Co_(17), Dy_2Co_7, DyCo_3were calculated to be -60. 8, -34. 6 and -34 . 2 kJ·mol￣(-1), respectively, at 1073 K. The relationshipbetween diffusion coefficient and temperature of dysprosium atom in Dy_2Co_917) alloy phase can be expressedas InD = 124. 7 × 10￣3/RT-7. 9, the diffusion activation energy is 124. 7 kJ· mol￣(-1) . The Dy-Co alloywas prepared by consumable cathode in molten chlorides. The Dy-Co alloy contained dysprosium over 95wt% was obtained. The composition of alloy was DyCo_3 and dysprosium.
