The codepostion of Sm Co on Cu electrodes was investigated in urea NaBr melt containing SmCl 3 and CoCl 2 at 398 K.Potentiostatic electrolysis was used to prepare the Sm Co films with various Sm contents.Gray black an...The codepostion of Sm Co on Cu electrodes was investigated in urea NaBr melt containing SmCl 3 and CoCl 2 at 398 K.Potentiostatic electrolysis was used to prepare the Sm Co films with various Sm contents.Gray black and lustrous films with strong adhesion on Cu were obtained.The experimental results also show that Sm can be inductively codeposited with Co EDAX indicated that,with increasing of deposition potential,the content of Sm in Sm Co increases first and then drops down gradually.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
文摘The codepostion of Sm Co on Cu electrodes was investigated in urea NaBr melt containing SmCl 3 and CoCl 2 at 398 K.Potentiostatic electrolysis was used to prepare the Sm Co films with various Sm contents.Gray black and lustrous films with strong adhesion on Cu were obtained.The experimental results also show that Sm can be inductively codeposited with Co EDAX indicated that,with increasing of deposition potential,the content of Sm in Sm Co increases first and then drops down gradually.
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.
