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Citation: LI Jia-Xin, LAI Heng, ZHANG Zhi-Cheng, ZHUANG Bin, HUANG Zhi-Gao. Electrodeposited Sm-Co Alloy Films and Their Magnetic Properties in Low Temperature Molten Salts[J]. Acta Physico-Chimica Sinica, ;2007, 23(08): 1301-1305. doi: 10.3866/PKU.WHXB20070832 shu

Electrodeposited Sm-Co Alloy Films and Their Magnetic Properties in Low Temperature Molten Salts

1.
Department of Physics, Fujian Normal University, Fuzhou 350007, P. R. China

Received Date: 14 February 2007
Available Online: 17 May 2007

Electrodeposited Sm-Co alloy films, obtained on copper substrate in urea-acetamide-NaBr-KBr melt at 353 K, were prepared. The cyclic voltammetry was used to study the electrochemical processes. Electroreduction of Co (II) to metallic Co was irreversible in one step. On Pt electrode the diffusion coefficient D0 and electron transfer coefficient α of Co(II) in CoCl2 (0.040 mol·L-1)-urea-acetamide-NaBr-KBr were determined. Their values were obtained as follows: α=0.31 and D0=4.78×10^-5 cm2·s-1. Sm(III) was not reduced to Sm alone, but it could be inductively codeposited with Co (II). The cathode potential had evident effect on the content of Sm in the Sm-Co alloy films. The content of Sm was analyzed by inductive coupled plasma emission spectrometer (ICPES). The structures phase of the deposits before and after annealing at 923K for 30 s were investigated by XRD, magnetic properties were measured by vibrating sample measurement (VSM), and the microstructure was observed by scanning electron micrographs (SEM). The experimental results revealed that, (1) the prepared samples were amorphous while the annealed those were polycrystalline, and there existed a main hcp phase in annealed polycrystalline samples; (2) the annealing and the samariumcontent had important influence on magnetic properties of SmxCo5 alloy films.
- Sm-Co alloy films; Inductive codeposition; Magnetic properties; Microstructure
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