间隙碳原子对(Er_(1-x)Sm_x)_2Fe_(17)C_y化合物形成、结构与磁性的影响  

INFLUENCE OF INTERSTITIAL CARBON ATOMS ON FORMATION, STRUCTURE AND MAGNETIC PROPERTIES OF (Er_(1-x)Sm_x)_2Fe_(17)C_y COMPOUNDS

作　　者：沈保根[1] 孔麟书[1] 曹蕾[1] 王芳卫[1] 詹文山[1] 郭慧群[1] 赵见高[1] 

机构地区：[1]中国科学院物理研究所磁学国家重点实验室

出　　处：《金属学报》1993年第10期B458-B463,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金

摘　　要：用快淬方法制备了单相(Er_(1-x)Sm_x)_2Fe_(17)C_y(x=0.2,<3.0;x=0.5,y<2.0)化合物,研究了它们的形成、结构、稳定性及内禀磁性结果表明,它们在高温是稳定的,随碳含量的增加,晶体结构由六角的Th_2Ni_(17)型向菱方的Th_2Zn_(17)型转变间隙碳原子的引入导致了单胞体积的膨胀、室温饱和磁化强度和Curie温度的增加当y>1.0时,(Er_(1-x)Sm_x)_2Fe_(17)The (Er_(1-x)Sm_x)_2Fe_(17)C_y(x=0.2, y≤3.0; x=0.5, y≤2.0) compounds with a 2:17-type single phase structure were prepared by melt-spinning. The formation, structure, stability and intrinsic magnetic properties of these carbides were studied. The experimental re- sults show that these carbidek are stable at high temperatures. With increasing carbon concen- tration x, their crystal structure changes from the hexagonal Th_2Ni_17-type to rhombohedral Th_2Zn_(17)-type. The introduction of interstitial carbon atoms results in the expansion of the unit cell volumes and the increase of the room temperature saturation magnetization and Curie temperature. The (Er_(1-x)Sm_x)_2Fe_17C_y carbides with y≥1.0 are found to have an easy c-axis anisotropy at room temperature.

关 键 词：碳化物 碳 原子 磁性 

分 类 号：O614.811[理学—无机化学]