【作者】 周甫方；

【导师】 赵彦明；

【作者基本信息】 汕头大学 ， 材料物理与化学， 2005， 硕士

【摘要】 本文采用X射线衍射法和热分析法测定了固相线下Ce—Co—Al三元体系相关系,主要实验结果包括: 在Ce—Co一Al三元体系中,在Co:Ce和Al:Ce原子比分别大于11:25和1:3的区域存在四个三元化合物Ce₂Co₁₅Al₂,CeCoAl,CeCoAl₄,D（Ce/Co/Al at%接近8/22/70）Ce—Co—Al三元体系800℃等温截面（在富Ce和富Al区为550℃等温截面）分为20个三相区和3个两相区。 对Ce（Co,Al）₁₅、Ce（Co,Al）₁₁体系进行了大量尝试,没有充足证据证明存在CeCo_13-xAl_x、CeCo_11-xAl_x化合物。但确实存在新相,由于未得到单相,结构不能确定。 通过磁测量手段对富过渡族-稀土化合物Ce₂Co_15-xAl_2+x体系的磁性进行了研究。结果如下:Ce₂Co₁₇的磁性参数与文献报导的结果基本一致,与它相比Ce₂Co₁₅Al₂磁性要差.在Ce₂Co_15-xAl_2+x体系中,随Al含量增大,磁性减弱,逐渐由铁磁性转变成顺磁性。更多还原

【Abstract】 Phase equilibria in the ternary Ce-Co-Al system up to a Co : Ce atomic ratio of 11 : 25 and a Al : Ce atomic ratio of 1 : 3 were studed by means of X-ray powder diffraction and differential thermal analysis. A total of four ternary compounds were identified:Ce₂Co₁₅Al₂, CeCoAl, CeCoAl₄, D（Ce/Co/Al at% about 8/22/70）. This isothermal section of Ce-Co-Al ternary system consists of 20 three-phase and 3 two-phase regions.Great efforts were made searching for CeCo_13-xAl_x , CeCo_11-xAl_x compounds in Ce （Co, Al） ₁₅, Ce （Co, Al） ₁₁systems , there is not enough evidence of their existence , but some new phases have been found all the same . Since the single-phase samples have not been obtained , their crystal structure cannot be made clear .The magnetic properties of the rich-transition-metal-rare-earth compounds system Ce₂Co_15-xAl_2+x were studed by means of magnetic measurements . The results are : along with Al content increases , the magnetic properties of Ce₂Co_15-xAl_2+x decrease , and change from ferromagnetism to paramagnetism.更多还原