The cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behaviors of Er(Ⅲ) and Ni(Ⅱ) in LiClO 4 DMSO(dimethylsufoxide) system on Pt and Cu electrodes. Experimental results indica...The cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behaviors of Er(Ⅲ) and Ni(Ⅱ) in LiClO 4 DMSO(dimethylsufoxide) system on Pt and Cu electrodes. Experimental results indicated that the reduction of Er(Ⅲ) to Er and Ni(Ⅱ) to Ni were irreversible in one step on Pt and Cu electrodes. The diffusion coefficient and electron transfer coefficient of Er(Ⅲ) in 0.01 mol·L -1 ErCl 3 -0.1 mol·L -1 LiClO 4 DMSO system at 303K were 1.47×10 -10 m 2·s -1 and 0.108 respectively, and the diffusion coefficient and electron transfer coefficient of Ni(Ⅱ) in 0.01 mol·L -1 NiCl 2-0.1 mol·L -1 LiClO 4 DMSO system at 303K were 3.38×10 -10 m 2·s -1 and 0.160 respectively. The homogeneous, strong adhesive Er Ni alloy films with metallic lu- stre was prepared by potentiostatic electrolysis on Cu electrode in ErCl 3 NiCl 2 LiClO 4 DMSO system at -1.90～ -2.55 V (vs SCE).展开更多
The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe 2+ and La 3+ in FeCl 2 LiCl DMSO and LaCl 3 LiCl DMSO systems on Pt, Cu and Ni cathodes. Th...The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe 2+ and La 3+ in FeCl 2 LiCl DMSO and LaCl 3 LiCl DMSO systems on Pt, Cu and Ni cathodes. The electroreduction of Fe 2+ to Fe is irreversible in one step,while the electroreduction of La 3+ to La is quasi reversible. The diffusion coefficient of La 3+ in LaCl 3 LiCl DMSO system at 298 K was 3 1×10 -6 cm 2·s -1 . The diffusion coefficient and transfer coefficient of Fe 2+ in FeCl 2 LiCl DMSO system at 298 K were 2 54×10 -6 cm 2·s -1 and 0 24, respectively. La Fe alloy films containing La from 22 7% to 37 1% (mass fraction) were prepared by potentiostatic electrolysis on Cu substrates at a deposition potential from -1 750 to -2 450 V (vs SCE). The fine La Fe alloy films were also obtained by pulse electrolysis at a pulse current densities from 2 to 6 mA·cm -2 . The surfaces of these alloy films are smooth, adhesive and uniform, and have metallic luster.展开更多
Deposition of Yb-Bi thin films was carried out from a nonaqueous solution by using cyclic electrodepositon. During electrodeposition the substrate potential was continuously cycled between two potentials. The effects ...Deposition of Yb-Bi thin films was carried out from a nonaqueous solution by using cyclic electrodepositon. During electrodeposition the substrate potential was continuously cycled between two potentials. The effects of several factors including the potential of deposition, time of deposition and sweep rate on the Yb content in the thin films and surface morphology were studied. Experimental results indicate that the amorphous Yb-Bi thin films containing Yb 21.04%～36.36% (mass fraction) can be prepared in 0.10 mol·L^(-1) YbCl_3+0.10 mol·L^(-1) Bi(NO_3)_3+0.10 mol·L^(-1) LiCl+DMSO by controlling deposition conditions of the system. They are black, uniform, metallic luster and adhered firmly to the copper substrates. The films were characterized by X-ray energy dispersive analysis (EDS), scanning electron microcoscope (SEM) and X-ray diffraction (XRD).展开更多
Dense, adhesive and uniform Sm-Co alloy films were prepared by potentiostatic electrolysis on copper substrates in urea-acetamide-NaBr-KBr melt at 353 K, which were observed by SEM. The electroreduction of Co2+ and Sm...Dense, adhesive and uniform Sm-Co alloy films were prepared by potentiostatic electrolysis on copper substrates in urea-acetamide-NaBr-KBr melt at 353 K, which were observed by SEM. The electroreduction of Co2+ and Sm3+ was investigated by cyclic voltammetry. The reduction of Co2+ is an irreversible process. Sm3+ can not be reduced alone, but Sm-Co can be co-deposited by induced deposition. The films could be crystallized by heat-treatment at different temperature from 723 to 923 K under Ar atmosphere. The annealed time was chosen as 30 s. The phases of deposited and annealed films were investigated by XRD. The content of Sm was analyzed by Inductive Coupled Plasma Emission Spectrometer (ICPES). The hysteresis loops of the Sm-Co alloy films have been measured by Vibrating Sample Magnetometer (VSM). The experimental results reveal that, the heat-treatment has important influence on coercive field Hc and remanent squareness S of Sm-Co alloy films; the deposited Sm-Co alloy films are amorphous, while the annealed those become polycrystalline; in addition, the magnetocrystalline anisotropy and preferring orientation of films depend strongly on the contents of crystal phases.展开更多
A facile and efficient synthesis route for the preparation of Tm-Fe-Co-Ni-Mn multicomponent alloy films was reported.Here the films with nanostructures were successfully synthesized by electrodeposition at room temper...A facile and efficient synthesis route for the preparation of Tm-Fe-Co-Ni-Mn multicomponent alloy films was reported.Here the films with nanostructures were successfully synthesized by electrodeposition at room temperature.By changing the electrodeposition parameters,such as the deposition potential,deposition time,and the substrates,the styles of the nanostructures and surface morphologies of the deposits could be well controlled.The energy dispersive spectrometer （EDS） indicated that the five elements were co-deposited.The result of XRD suggested that the film was amorphous.The as-deposited alloys showed soft magnetic and superparamagnetic behavior,and the magnetic particles were frozen step by step in the freezing process.展开更多
文摘The cyclic voltammetry and chronoamperometry were used to investigate the electrochemical behaviors of Er(Ⅲ) and Ni(Ⅱ) in LiClO 4 DMSO(dimethylsufoxide) system on Pt and Cu electrodes. Experimental results indicated that the reduction of Er(Ⅲ) to Er and Ni(Ⅱ) to Ni were irreversible in one step on Pt and Cu electrodes. The diffusion coefficient and electron transfer coefficient of Er(Ⅲ) in 0.01 mol·L -1 ErCl 3 -0.1 mol·L -1 LiClO 4 DMSO system at 303K were 1.47×10 -10 m 2·s -1 and 0.108 respectively, and the diffusion coefficient and electron transfer coefficient of Ni(Ⅱ) in 0.01 mol·L -1 NiCl 2-0.1 mol·L -1 LiClO 4 DMSO system at 303K were 3.38×10 -10 m 2·s -1 and 0.160 respectively. The homogeneous, strong adhesive Er Ni alloy films with metallic lu- stre was prepared by potentiostatic electrolysis on Cu electrode in ErCl 3 NiCl 2 LiClO 4 DMSO system at -1.90～ -2.55 V (vs SCE).
文摘The cyclic voltammetry and potential step methods were used to investigate the electrochemical behavior of Fe 2+ and La 3+ in FeCl 2 LiCl DMSO and LaCl 3 LiCl DMSO systems on Pt, Cu and Ni cathodes. The electroreduction of Fe 2+ to Fe is irreversible in one step,while the electroreduction of La 3+ to La is quasi reversible. The diffusion coefficient of La 3+ in LaCl 3 LiCl DMSO system at 298 K was 3 1×10 -6 cm 2·s -1 . The diffusion coefficient and transfer coefficient of Fe 2+ in FeCl 2 LiCl DMSO system at 298 K were 2 54×10 -6 cm 2·s -1 and 0 24, respectively. La Fe alloy films containing La from 22 7% to 37 1% (mass fraction) were prepared by potentiostatic electrolysis on Cu substrates at a deposition potential from -1 750 to -2 450 V (vs SCE). The fine La Fe alloy films were also obtained by pulse electrolysis at a pulse current densities from 2 to 6 mA·cm -2 . The surfaces of these alloy films are smooth, adhesive and uniform, and have metallic luster.
文摘Deposition of Yb-Bi thin films was carried out from a nonaqueous solution by using cyclic electrodepositon. During electrodeposition the substrate potential was continuously cycled between two potentials. The effects of several factors including the potential of deposition, time of deposition and sweep rate on the Yb content in the thin films and surface morphology were studied. Experimental results indicate that the amorphous Yb-Bi thin films containing Yb 21.04%～36.36% (mass fraction) can be prepared in 0.10 mol·L^(-1) YbCl_3+0.10 mol·L^(-1) Bi(NO_3)_3+0.10 mol·L^(-1) LiCl+DMSO by controlling deposition conditions of the system. They are black, uniform, metallic luster and adhered firmly to the copper substrates. The films were characterized by X-ray energy dispersive analysis (EDS), scanning electron microcoscope (SEM) and X-ray diffraction (XRD).
基金the National Key Project for Basic Research of China (20005CB623605)NSF of Fujian Province(A0510013)
文摘Dense, adhesive and uniform Sm-Co alloy films were prepared by potentiostatic electrolysis on copper substrates in urea-acetamide-NaBr-KBr melt at 353 K, which were observed by SEM. The electroreduction of Co2+ and Sm3+ was investigated by cyclic voltammetry. The reduction of Co2+ is an irreversible process. Sm3+ can not be reduced alone, but Sm-Co can be co-deposited by induced deposition. The films could be crystallized by heat-treatment at different temperature from 723 to 923 K under Ar atmosphere. The annealed time was chosen as 30 s. The phases of deposited and annealed films were investigated by XRD. The content of Sm was analyzed by Inductive Coupled Plasma Emission Spectrometer (ICPES). The hysteresis loops of the Sm-Co alloy films have been measured by Vibrating Sample Magnetometer (VSM). The experimental results reveal that, the heat-treatment has important influence on coercive field Hc and remanent squareness S of Sm-Co alloy films; the deposited Sm-Co alloy films are amorphous, while the annealed those become polycrystalline; in addition, the magnetocrystalline anisotropy and preferring orientation of films depend strongly on the contents of crystal phases.
基金Project supported by the National Natural Science Foundations of China (20873184 and 90923008)the Natural Science Foundations of Guang-dong Province (07300877 and 9251027501000002)+1 种基金the Science and Technology Planning Project of Guangdong Province (2008B010600040)the Foundations of Young Teacher Starting-up Research of Yuncheng University (YQ-2010013)
文摘A facile and efficient synthesis route for the preparation of Tm-Fe-Co-Ni-Mn multicomponent alloy films was reported.Here the films with nanostructures were successfully synthesized by electrodeposition at room temperature.By changing the electrodeposition parameters,such as the deposition potential,deposition time,and the substrates,the styles of the nanostructures and surface morphologies of the deposits could be well controlled.The energy dispersive spectrometer （EDS） indicated that the five elements were co-deposited.The result of XRD suggested that the film was amorphous.The as-deposited alloys showed soft magnetic and superparamagnetic behavior,and the magnetic particles were frozen step by step in the freezing process.
