Variation of the Magnetic Properties of Sm (Co, Cu)5 Alloys with Temperature
Variation of the Magnetic Properties of Sm (Co, Cu)5 Alloys with Temperature
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Sm(Co,Cu)5合金的磁性能随温度的变化
DOI：
10.2320/matertrans1960.14.135
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发表时间：
1973
影响因子：
1.2
通讯作者：
Yasuhiko Itayama
中科院分区：
文献类型：
--
作者：
K. Kamino;Y. Kimura;Tsutomu Suzuki;Yasuhiko Itayama
稀土类钴化合物R（Co，Cu）5的改性永磁体作为具有复杂分解机理的合金是公知的。研究了Sm（Co，Cu）合金的磁性能随温度的变化规律。磁性值的最佳区域从化合物SmCos与SmCu 5的连线向贫钐侧移动。差热分析（DTA）显示吸热反应温度约为920°C，并且在含有16至66 at铜的合金中几乎没有变化。这表明，在该温度下，无论铜含量如何，都可能发生相变。在Sm（Co，Cu）_5合金中，单一居里点（T.）从铸态条件下快速加热时观察到的居里点，在1000°C加热30 min后缓慢冷却时观察到两个居里点。其中一个居里点属于SmCo 5结构类型，另一个属于与Sm 2Co 17同构的化合物。根据差热分析结果和Tc、磁性值的测定，提出了Sm-Co-Cu三元相图，其中初始含铜24 ~ 40at%的合金可发生亚稳分解。（1972年6月5日）
Modified permanent magnets of rare earth cobalt compounds, R(Co, Cu)5, are known as alloys having a complex decomposition mechanism. Studies of the variation of magnetic properties with temperature were carried out for Sm (Co, Cu), alloys containing 0 to 75 at % copper. The optimum area for magnetic values was shifted toward the samariumpoor side from the line connecting the compound SmCos with SmCu5. Differential thermal analysis (DTA) revealed that the endothermic reaction temperatures were around 920°C and scarcely varied in alloys containing from 16 to 66 at copper. This suggests that the phase transformation may occur at this temperature regardless of different copper contents. In Sm(Co, Cu)5 alloys a single Curie point (T.) was observed on rapid heating from the as-cast condition, and two points on slow cooling after heating at 1000°C for 30 min. One of the Curie points belongs to a SmCo5 structure type and the other to a compound isostructural with Sm2Co17. From the results of DTA and measurements of Tc and magnetic values, a hypothetical Sm-Co-Cu ternary phase diagram is proposed, in which the alloys initially containing 24 to 40 at % copper may decompose spinodally. (Received June 5, 1972)