The electrochemical formation processes of holmium-cobalt alloys on cobaltcathode in molten HoCl_3-KCl were investigated by cyclic voltammetry and open current potential-timecurve alter potentiostatic electrolysis. Th...The electrochemical formation processes of holmium-cobalt alloys on cobaltcathode in molten HoCl_3-KCl were investigated by cyclic voltammetry and open current potential-timecurve alter potentiostatic electrolysis. The structure of Ho-Co alloys' films deposited on cobaltelectrode by potentiostatic electrolysis was characterized by X-ray diffraction. The standard Gibbsfree energies of formation for the intermetallic compounds of Ho and Co were determined. Thediffusion coefficient and diffusion activation energy of Ho atom in the alloy phase were calculatedto be 10^(-10) -10^(-11) cm^2/s and 96.0 kJ/mol, respectively, from the current-time curve atpotential step.展开更多
The cyclic voltammetry and potentiostatic electrolysis were used toinvestigate the preparing of Dy-Bi alloy films in LiCl-DMSO (dimethylsulfoxide) system. The effectsof several factors including the potential of depos...The cyclic voltammetry and potentiostatic electrolysis were used toinvestigate the preparing of Dy-Bi alloy films in LiCl-DMSO (dimethylsulfoxide) system. The effectsof several factors including the potential of deposition, concentrations of main salts, and theconcentration ratio of DyCl_3 to Bi(NO_3)_3 were studied. Dy-Bi alloy films containing 4.82%-80.62%(mass fraction) dysprosium were prepared in DyCl_3-Bi(NO_3)_3-LiCl-DMSO system by controlling thesystem composition and deposition conditions. The films are gray, uniform, metallic luster andadhere firmly to the copper substrates analyzed by SEM (scanning electron microscope), EDS (X-rayenergy dispersive analysis), and XRD (X-ray diffraction). After heat treatment at 718 K for 1 h, thealloy phase of Dy-Bi was found in XRD patterns.展开更多
Cyclic voltammetry and chronoamperometry were used to investigate theelectrochemical behavior of Pr^(3+) ions in a system of 0.01 mol centre dot dm^(-3) Pr(CH_3SO_3)_3 +0.01 mol centre dot dm^(-3) FeCl_2 + 3.0 mol cen...Cyclic voltammetry and chronoamperometry were used to investigate theelectrochemical behavior of Pr^(3+) ions in a system of 0.01 mol centre dot dm^(-3) Pr(CH_3SO_3)_3 +0.01 mol centre dot dm^(-3) FeCl_2 + 3.0 mol centre dot dm^(-3) urea + DMSO on a R electrode. Someelectrochemical parameters were measured. Potentiostatic depositions between -1.6 and -2.4 V wereapplied to deposit Pr-Fe films in urea-DMSO mixed solution. The Pr content in the alloy films was inthe range of 34.89 wt. percent to 37.15 wt. percent. The Pr-Fe alloy films are proven to beamorphous by XRD (X-ray diffraction).展开更多
The Tm-Ni-Co alloy films have been prepared by the sweep potential deposition technique. The surface appear-ance of Tm-Ni-Co alloy films was silver smooth and adhesive. The surfaces of Tm-Ni-Co alloy films observed by...The Tm-Ni-Co alloy films have been prepared by the sweep potential deposition technique. The surface appear-ance of Tm-Ni-Co alloy films was silver smooth and adhesive. The surfaces of Tm-Ni-Co alloy films observed by scanningelectron microscope (SEM) were uniform, adhesive and compact. The sizes of metallic grains were about 80-100nm,100-200nm, 50-60nm, and 90-120nm at 1mV·s^(-1), 5mV·s^(-1), 10mV·s^(-1) and 50mV·s^(-1), respectively. The Tm-Ni-Co alloy film wasamorphous as proven by the X-ray diffraction(XRD).展开更多
文摘The electrochemical formation processes of holmium-cobalt alloys on cobaltcathode in molten HoCl_3-KCl were investigated by cyclic voltammetry and open current potential-timecurve alter potentiostatic electrolysis. The structure of Ho-Co alloys' films deposited on cobaltelectrode by potentiostatic electrolysis was characterized by X-ray diffraction. The standard Gibbsfree energies of formation for the intermetallic compounds of Ho and Co were determined. Thediffusion coefficient and diffusion activation energy of Ho atom in the alloy phase were calculatedto be 10^(-10) -10^(-11) cm^2/s and 96.0 kJ/mol, respectively, from the current-time curve atpotential step.
基金This project was financially supported by the Natural Science Foundation of Guangdong Province (No. 01125) and State Key Lab of Rare Earths Material Chemistry and Applications, Beijing 100871, China.
文摘The cyclic voltammetry and potentiostatic electrolysis were used toinvestigate the preparing of Dy-Bi alloy films in LiCl-DMSO (dimethylsulfoxide) system. The effectsof several factors including the potential of deposition, concentrations of main salts, and theconcentration ratio of DyCl_3 to Bi(NO_3)_3 were studied. Dy-Bi alloy films containing 4.82%-80.62%(mass fraction) dysprosium were prepared in DyCl_3-Bi(NO_3)_3-LiCl-DMSO system by controlling thesystem composition and deposition conditions. The films are gray, uniform, metallic luster andadhere firmly to the copper substrates analyzed by SEM (scanning electron microscope), EDS (X-rayenergy dispersive analysis), and XRD (X-ray diffraction). After heat treatment at 718 K for 1 h, thealloy phase of Dy-Bi was found in XRD patterns.
文摘Cyclic voltammetry and chronoamperometry were used to investigate theelectrochemical behavior of Pr^(3+) ions in a system of 0.01 mol centre dot dm^(-3) Pr(CH_3SO_3)_3 +0.01 mol centre dot dm^(-3) FeCl_2 + 3.0 mol centre dot dm^(-3) urea + DMSO on a R electrode. Someelectrochemical parameters were measured. Potentiostatic depositions between -1.6 and -2.4 V wereapplied to deposit Pr-Fe films in urea-DMSO mixed solution. The Pr content in the alloy films was inthe range of 34.89 wt. percent to 37.15 wt. percent. The Pr-Fe alloy films are proven to beamorphous by XRD (X-ray diffraction).
基金This work is financially supported by the Science Foundation of Guangdong Province (Nos 011215 and 36706).
文摘The Tm-Ni-Co alloy films have been prepared by the sweep potential deposition technique. The surface appear-ance of Tm-Ni-Co alloy films was silver smooth and adhesive. The surfaces of Tm-Ni-Co alloy films observed by scanningelectron microscope (SEM) were uniform, adhesive and compact. The sizes of metallic grains were about 80-100nm,100-200nm, 50-60nm, and 90-120nm at 1mV·s^(-1), 5mV·s^(-1), 10mV·s^(-1) and 50mV·s^(-1), respectively. The Tm-Ni-Co alloy film wasamorphous as proven by the X-ray diffraction(XRD).
