Mn_(3+x)Sn_(1-x)和Mn_(3.1)Sn_(0.9)N化合物的制备与结构  

Preparation & Structure of Mn_(3+x)Sn_(1-x) and Mn_(3.1)Sn_(0.9)N Compounds

作　　者：周腾蛟[1] 封文江[1] 张礼庆[1] 方戈亮[1] 赵子夫[1] 

机构地区：[1]沈阳师范大学物理科学与技术学院,辽宁沈阳110034

出　　处：《沈阳师范大学学报（自然科学版）》2010年第1期30-33,共4页Journal of Shenyang Normal University:Natural Science Edition

基　　金：辽宁省自然科学基金资助项目(20072056)

摘　　要：采用电弧熔炼和退火的方法,成功地制备了Mn3+xSn1-x(x=0.1,0.05,0)系列样品。采用热重-热扫描(TG-DSC)研究了Mn3.1Sn0.9的吸氮峰,并成功氮化出Mn3.1Sn0.9N化合物。X射线衍射,扫描电镜和能谱X射线分析证明Mn3.1Sn0.9与Mn3.05Sn0.95均为Mn3Sn单相。而Mn3.0Sn1.0样品为Mn1.77Sn与Mn3Sn两相共存。在N2气氛下Mn3.1Sn0.9的TG-DSC曲线显示,在1 151 K和1 267 K出现2个吸氮峰。在1 151 K对Mn3.1Sn0.9渗氮得到Mn3.1Sn0.9N单相。Mn3.1Sn0.9与Mn3.1Sn0.9N化合物的结构相关,但各自的Mn原子间距差别明显。在Mn3.1Sn0.9的八面体间隙位引入N原子,通过相邻2层的间隙或者同一层的间隙才能进入体心位。这也说明在TG-DSC曲线上出现2个连续的、相隔不远的吸氮峰的原因。实验上也证明在2个温度渗氮得到的是相同的化合物。By means of magneto-controlled arc furnace followed by annealling, Mn3＋xSn1-x （ x= 0. 1,0.05,0 ） compounds were successfully prepared. TG-DSC reveals both nitrogen-absorption peaks on the curve of Mn3.1Sn0.9, and Mn3.1 Sn0. 9 N compound was produced. By means of X-ray diffraction, SEM and EDS X-ray analysis, both Mn3.1Sn0.9 and Mn3.05Sn0.05 compounds exhibit single phase, while Mn3. 0Sn1. 0 sample displays a coexistence of Mn1. 77Sn and Mn3Sn phases. The TG-DSC curves reveal, double nitrogen-absorption peaks occur at 1 151 and 1 267 K respectively. By nitrogenation of Mn3.1Sn0.9, Mn3.1 Sn0.9N compound can be produced at 1 151 or 1 267 K. Despite the correlation between Mn3.1Sn0.9 and Mn3.1Sn0.9N, the distance between Mn atoms of them is different. In order to introduce N atom into the interstices of Mn3.1Sn0.9, N atoms enter into either the interstices between the nearest and second nearest or the interstice of bottom cells of Mn3.1 Sn0.9, which illustrates the presence of both nitrogen-absorption peaks on the TG-DSC curves. Moreover, the experience also confirms our analysis.

关 键 词：TG-DSC 吸氮峰 渗氮 原子结构示意图 

分 类 号：TB303[一般工业技术—材料科学与工程]