稀土SM_2Fe_(17)型永磁材料X射线无标定量相分析

X-ray None-standard Quantitative Phase Analysis on Rare Earth Sm_2Fe_(17)-type Permanent Magnetic Materials

具有优良内禀磁性能的 Sm2Fe17型稀土永磁材料是当前磁性材料领域研究的热点之一.通过分析 Sm2Fe17 型菱方结构和体心立方 -Fe 中原子坐标计算得到了 Sm2Fe17 相的 303 衍射在 2 303= 42.57 °和 -Fe 的 110 衍射在 2 110= 45.067 °的结构因子 F 分别为 651.91 与 31.52.由单相计算结果与试验值及标准值的对比发现,利用 X 射线衍射的测量值,用直接对比法分析 Sm2Fe17 型稀土永磁材料中物相的组成是可行的.退火态和 HDDR 处理后 Sm10.5Fe89.5 和 Sm12.8Fe87.2合金的物相组成计算表明,多添加质量分数为 25%的Sm,可以补偿钐在熔炼时的挥发,使退火后Sm12.8Fe87.2合金的 -Fe 量减少到体积百分比 1.7%.多添加金属 Sm 对 HDDR 工艺中的复合过程没有明显的补偿效果,对减少 HDDR 工艺后的残留 -Fe 含量作用不大.

Therare-earth-transition-metal Sm2Fe17-type compounds had attracted much attention becauseof their ex- cellent intrinsicmagnetic properties. The structure factors = 651.91 at 2 303= 42.57 ° for 303 diffraction of Sm2Fe17 phase, and = 31.52 at 2 110= 45.067 ° for 110 diffraction of -Fe phase were calculated by analyzing the atom coordinatesof rhombohedral Sm2Fe17 and body centered cubic -Fe. Comparing the relativeintensitiesof single phase Sm2Fe17 and -Fe with the experiment values and the calculated results, it was shown that it was feasible and reliable using directly comparing method by calculating value to analyze the phase percent content of Sm2Fe17-type alloys. The phase compositions of Sm10.5Fe89.5 and Sm12.8Fe87.2 of annealed and HDDR-treated samples were calculated. It was found that extra 25wt% Sm could compensate excessive loss of samarium due to vaporization and only 1.7% -Fe was remained in annealed Sm12.8Fe87.2 alloy, but extra 25% Sm was not evidently good for recombination and reducing the remained -Fe content during HDDR process.