Wei Jei C, Schwartz Morton, Nobe Ken, Myung Nosang V
University of California at Los Angeles, Los Angeles, CA, United States.
University of Notre Dame, Notre Dame, IN, United States.
Front Chem. 2021 Sep 1;9:694726. doi: 10.3389/fchem.2021.694726. eCollection 2021.
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 ( 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/cm. Supporting electrolytes ( 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 (M) and coercivity (H). A deposition mechanism involving stepwise reduction of the complexed Sm-Co ions by depositing hydrogen atoms was proposed.
此前，我们报道了稀土 - 铁族合金的水溶液电沉积。一个关键因素是金属离子与各种配位化合物（氨基酸）的络合，没有这种络合，仅会沉积黑色金属和稀土氢氧化物/氧化物。在这项工作中，使用直流（DC）水溶液电沉积合成了钐钴（SmCo）合金。基本电解质溶液由1M氨基磺酸钐、0.05M硫酸钴和0.15M甘氨酸组成，在60°C、电流密度为500mA/cm²的条件下得到的沉积物中Sm含量>30原子%。支持电解质（铵盐）降低了沉积物中的Sm含量。随着Sm含量的增加，沉积膜的结晶度从纳米晶变为非晶态。高Sm含量（32原子%）的沉积物变得各向同性，同时磁饱和（M）和矫顽力（H）降低。提出了一种沉积机制，即通过沉积氢原子逐步还原络合的Sm-Co离子。
