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Electrodeposition of Sm-Fe films in 1,3-dimethyl-2-imidazolidinone-LiNO3 solvated ionic liquid at room temperature
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DOI：10.1016/j.vacuum.2026.115570.png)
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Abstract
En 中文
Samarium-iron (Sm-Fe) permanent magnets represent a significant class of magnetic materials whose comprehensive magnetic properties are comparable to those of NdFeB magnets, and serve as one of the principal raw materials for producing the fourth-generation rare earth magnetic material SmFeN. In this study, Sm(CF3SO3)3 and FeCl2 were dissolved in a solvated ionic liquid composed of 1,3-dimethyl-2-imidazolidinone (DMI) and LiNO3, and attempts were made to electrodeposit Sm-Fe alloy films at room temperature. The electrochemical behaviors of Sm(III) and Fe(II) in this ionic liquid were investigated using cyclic voltammetry. Furthermore, Sm-Fe films were electrodeposited from a DMI-LiPF6-Sm(CF3SO3)3-FeCl2 electrolyte, and the influence of deposition potential and metal salt molar ratio on the microscopic morphology of cathodic plating were investigated. The results indicate that the co-deposition of Sm with Fe can be achieved in this system, in which the reduction of Sm(III) proceeds via a two-step mechanism. The reduction of Sm(III) to Sm(II) is a diffusion-controlled irreversible process, with a diffusion coefficient of 5.34 × 10−9 cm2/s at 333 K. The main phase identified in the cathode product was Sm2Fe17, in which the mass fractions of Sm and Fe were 32.57% and 19.80%, respectively. When the molar ratios of Sm(CF3SO3)3 to FeCl2 were set at 20:1 and 60:1, Sm-Fe films with smooth and flat surfaces were successfully obtained by electrodeposition at potentials of −2.4 V and −2.6 V (vs. Ag).
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