Sm2Fe17化合物的差热-热重分析  

Investigation of the Phase Structure of Sm_2Fe_(17) Compound by Differential Thermal/Thermogravimetric Analyzer

作　　者：郝延明[1] 安立群[1] 谭明[2] 谈清华[2] 王玲玲[2] 严达利[2] 

机构地区：[1]天津科技大学理学院,天津300222 [2]天津师范大学物理系,天津300387

出　　处：《稀有金属》2009年第1期76-79,共4页Chinese Journal of Rare Metals

基　　金：国家自然科学基金(50871074);天津科技大学博士基金(0200153)资助项目

摘　　要：通过X射线衍射、差热-热重(DTA-TG)联用仪以及磁测量等手段研究了Sm2Fe17化合物及其氮化物的相结构和磁性。通过对Sm2Fe17化合物的DTA-TG分析可以得到:当温度从室温(约300 K)升至1473 K的过程中,在N2保护的条件下,N原子扩散进入Sm21Fe17化合物中,在温度为700 K左右时Sm2Fe17化合物吸氮反应最剧烈,吸氮的结果使得Sm2Fe17Nx化合物的居里温度显著提高。随着温度的继续升高,在吸氮反应的同时,Sm2Fe17Nx化合物变的不稳定,部分分解为SmN化合物和Fe。对实验结果的分析可以得出,该化合物在接近熔点的1473 K以下只存在Th2Zn17型结构,不存在Th2Ni17型结构。The structure and magnetic properties of SmEFe17 compound and its nitrides were investigated by means of differential thermal/thermogravimetric analysis. The result shows that the Curie temperature of SmEFe17Nx nitrides was improved obviously. The analysis shows that the increase of the Curie temperature was caused by interstitial N-atoms be incorporated into 3d-sublattice. At higher nitrogenized reaction of temperature than 700 K, the Sm2Fe17 became violent, in the meantime, the decomposed reaction of Sm2Fe17TNx took place and resuhsed in SmN compounds and α- Fe. The SmzFe17 or SmEFe17TNx exhibited only singlephases of ThzZn17 below 1473 K.

关 键 词：Sm2Fe17 化合物 X射线衍射 差热-热重分析 

分 类 号：TG113[金属学及工艺—物理冶金] O482[金属学及工艺—金属学]