Nd_2Fe_(14.5)Cr_(2.5)化合物的结构和相变  

Structure and Phase Transition of Nd_2Fe_(14.5)Cr_(2.5) Compound

作　　者：高纯静[1] 郝延明[1] 梁飞飞[1] 郑开萍[1] 胡怀古[1] 

机构地区：[1]天津科技大学理学院,天津300222

出　　处：《中国稀土学报》2012年第6期699-702,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(50871074);天津科技大学自然科学基金(0200153)资助

摘　　要：通过X射线衍射、差热分析及磁测量等手段对电弧炉熔炼的Nd2Fe14.5Cr2.5化合物的结构和相变进行了研究,研究结果表明,950℃下退火的样品具有Th2Zn17型结构,其居里温度为375 K。1100℃下退火的样品具有Nd3(Fe,Ti)29型结构,其居里温度为445 K。Nd2Fe14.5Cr2.5化合物在1100℃左右发生结构相变,由菱方相的Th2Zn17型结构转变成单斜相的Nd3(Fe,Ti)29型结构。具有Th2Zn17型相结构的Nd2Fe14.5Cr2.5化合物在约300℃左右可以发生有效的吸氮反应。Structure and its phase transitions of the arc-melted Nd/Fe14,5 Cr2.5 were investigated by using differential thermal analyzer, X-ray diffractions, and magnetization measurements. The result showed that the sample annealed at 950 ℃ had a Th2Zn17-type structure, its Curie temperature was about 375 K. The sample annealed at 1100℃ had a Nd3（Fe,Ti）29 structure, its Curie temperature was about 445 K. At about 1100℃, the structure phase transition was oc- curred, and the rhombohedral Th2ZnlT-type structure translated into monoclinic Nd3 （ Fe, Ti） 29-type struc- ture. The nitrogenized reaction of the compound with Th2Zn17-type structure was more sufficient at about 300℃. The detailed discussion was presented.

关 键 词：Nd2Fe14 5Cr2 5化合物 相变 居里温度 稀土 

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