Abstract SmCo5 alloy was prepared via direct calciothermic reduction using anhydrous samarium fluoride (SmF3) as raw material and cobalt as inducer. Results of the thermodynamic calculation show that the direct reduction of cobalt-induced SmF3 for preparing SmCo5 alloy is feasible. An alloy with 33.89 wt% samarium and a yield of 96.45% were achieved under the optimal conditions of 10% and 20% excess of SmF3 and calcium over the stoichiometry, respectively, and 1450 °C for 4 min. The X-ray diffraction results show that the reduction products are SmCo5 alloy and CaF2. The scanning electron microscopy micrograph of the SmCo5 alloy ingot exhibits a distinct dendritic morphology composed of samarium and cobalt. The X-ray photoelectron spectroscopy shows that the atomic ratio of samarium to cobalt is approximately 1:5 and both elements demonstrate zero valency (Sm0, Co0). The magnetic properties measurement of the SmCo5 alloy melt-spun ribbon shows the remanent magnetization Br = 0.59 T, intrinsic coercivity Hci = 345.82 kA/m and maximum magnetic energy density (BH)max = 42.20 kJ/m3. These results may be helpful for the development of novel valence-variable rare-earth alloys.

中文翻译：

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钴诱导钙热还原制备 SmCo5 合金及其带的磁性能

摘要 以无水氟化钐（SmF3）为原料，钴为诱导剂，通过直接钙热还原法制备了SmCo5合金。热力学计算结果表明，直接还原钴诱导的 SmF3 制备 SmCo5 合金是可行的。在 SmF3 和钙分别超过化学计量比的 10% 和 20% 的最佳条件下，以及 1450 °C 下 4 分钟，获得了含有 33.89 wt% 钐和 96.45% 产率的合金。X射线衍射结果表明还原产物为SmCo5合金和CaF2。SmCo5 合金锭的扫描电子显微镜显微照片显示出由钐和钴组成的明显树枝状形态。X 射线光电子能谱显示钐与钴的原子比约为 1：图 5 中的两种元素都显示出零价态 (Sm0, Co0)。SmCo5 合金熔纺带的磁性能测量显示剩余磁化强度 Br = 0.59 T，固有矫顽力 Hci = 345.82 kA/m，最大磁能密度 (BH)max = 42.20 kJ/m3。这些结果可能有助于开发新型价变稀土合金。