Binary system SmCo: revision of the phase diagram in the Co rich field
Binary system SmCo: revision of the phase diagram in the Co rich field
复制标题
DOI：
10.1016/0925-8388(96)02308-0
复制
发表时间：
1996-08
影响因子：
6.2
通讯作者：
L. Cataldo;A. Lefevre;F. Ducret;M. Cohen‐Adad;C. Allibert;N. Valignat
中科院分区：
文献类型：
--
作者：
L. Cataldo;A. Lefevre;F. Ducret;M. Cohen‐Adad;C. Allibert;N. Valignat
用差热分析法研究了Co <$Sm二元系在0-26 at/% Sm范围内的相图，用X射线衍射和电子探针分析了Sm 2Co 17、SmCo 5、Sm 5Co 18、Sm 2Co 7和SmCo 5的结构。Sm_2Co_（17）的全等熔点得到了确认，在1325°C以下观察到的结构形式仅为菱面体结构。SmCo_5是通过包埋反应生成的，它不是化学计量的，并确定了固溶体的范围。用差热分析法测定了Sm_2Co_（17）的亚稳非等成分熔点和稳定的包绕分解温度。微探针分析表明，所观察到的阶段是稍微丰富的钐比他们的公式所示。
The phase diagram of the binary system CoSm was studied in the composition range 0–26 at/% Sm by differential thermal analysis, and the observed solid phases Sm2Co17, SmCo5, Sm5Co18, Sm2Co7and SmCo5were characterized by X-ray diffraction and electron microprobe analysis. The congruent melting point of Sm2Co17is confirmed, and up to 1325°C the observed structural form is only the rhombohedral one. SmCo5is formed by peritectic reaction, it is not stoichiometric and the range of solid solution is determined. The metastable uncongruent melting point of Sm2Co7and the stable peritectic decomposition of Sm2Co17were determined by DTA. Microprobe analysis shows that the observed phases are slightly richer in samarium than indicated by their formulas.