Abstract
Previously, we reported the aqueous electrodeposition of rare earth - iron group alloys. A key factor was the complexation of the metal ions with various coordination compounds (e.g., aminoacetic acids), without which only the ferrous metal and rare earth hydroxides/oxides are deposited. In this work, samarium cobalt (SmCo) alloys were synthesized using direct current (DC) aqueous electrodeposition. The basic electrolyte solution consisted of 1 M samarium sulfamate, 0.05 M cobalt sulfate, and 0.15 M glycine, resulting in deposits containing >30 at% Sm at 60°C with current density of 500 mA/cm2. Supporting electrolytes (i.e., ammonium salts) decreased the Sm content in the deposit. Crystallinity of deposited films altered from nanocrystalline to amorphous as the Sm content increased. Deposits with high Sm content (32 at%) became isotropic with reduction in magnetic saturation (Ms) and coercivity (Hc). A deposition mechanism involving stepwise reduction of the complexed Sm-Co ions by depositing hydrogen atoms was proposed.
Highlights
High-performance permanent magnets such as samarium-cobalt (SmCo) and neodymium-ironboron (NdFeB) alloys are playing an increasingly prominent role in miniaturizing electrical and electronic machines and devices
Samarium cobalt alloys were electrodeposited from aqueous solutions containing
While they contribute to the solution stability
Summary
High-performance permanent magnets such as samarium-cobalt (SmCo) and neodymium-ironboron (NdFeB) alloys are playing an increasingly prominent role in miniaturizing electrical and electronic machines and devices. In a series of preliminary studies, we reported on the aqueous electrodeposition of alloys of RE mischmetals, La, Ce, Nd, Gd and Sm with the iron group metals (e.g., Ni, Co, and Fe). The present work reports on the aqueous DC electrodeposition of SmCo alloys using parallel electrodes. The electrodeposition cell consisted of two parallel electrodes (brass cathode, 2 × 2 cm, and a platinum anode, 3 × 6 cm), which were 4 cm apart. All measurements and data reported were on deposits with metallic appearance, unless otherwise noted. CDmax is the maximum current density, beyond which deposits appeared non-metallic.
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