第34卷第7-8期
2015年8月特约专栏
中国材料进展 MATERIALS CHINA
Vol.34
No.78
Aug.2015
掺杂对Mn,Zno.6Geo.4N的负热膨胀 Si
和磁性能的影响
杰，赵玉强2，王
李少鹏1,2，谭
维'，黄荣进'，李来风"
（1．中国科学院理化技术研究所，北京100190）
（2.中国科学院大学，北京100190）
摘
要：为了探究Si元索对反钙钛矿材料Mn,ZnasGes4N的负热膨账和磁性能的影响，利用放电等离子体烧结法制备了一
系列Si掺杂的Mn,Zno.6Si,Gea4-,N(x=0，0.1，0.15，0.2）材料。材料的结构通过多晶粉末X射线衍射进行了表征，测试结果表明实验成功的制备了Mn;Zna.。Si,Gee.4-,N化合物（空间群Pm-3m）。接着，
，对Mn,Zna.6Si,Gea.4-,N进行了热影胀性能测
试，发现随着Si掺杂量的增加，样品的负热膨胀温区的起始温度向低温移动，而负热膨胀温区的宽度不变。Mn,Zna.6 Si,Geg4-,N的磁性能由物理性能测试系统(PPMS)进行了测试，结果表明，
，掺杂Si元索之后，在370K附近的顺磁-反铁磁
转变完全消失，这与掺杂Si元素之后，负热影账起始温度迟建向低温移动的现象一致，证明负热影胀现象与磁转变的紧密联
系。另外，Si掺杂使Mn,Zno.6Gee.4N在低温阶股出现自旋玻璃态现象，同时激发了样品的低温铁磁性。关键词：Mn,Zng.Geo.4N；Si掺杂；放电等离子体烧结；负热膨胀性能；磁性能
中图分类号：0611.3
文献标识码：A
文章编号：16743962(2015)07052105
EffectofSiDopingontheNegativeThermalExpansionand
Magnetic Properties of Mn, Zno.6 Geo.4 N gl-2, TAN Jie', ZHAO Yuqiang'-2,
LI Shaopeng
WANG Wei', HUANG Rongjin',LI Laifeng
(1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China)
(2. University of Chinese Academy of Seiences, Beijing 100190, China)
Abstract: In order to explore the effect of Si doping on the negative thermal expansion ( NTE) and magnetic properties of antiperovskite Mn,Zng s Geg.+N, a series of Si-doping Mn,Zna. Si,Gea.4-, N( x = 0, 0. 1, 0. 15, 0. 2) materials were prepared by spark plasma sintering ( SPS). The powder X-ray diffraction measurement was conducted in order to charac-terize the structures of the products, the results of which manifest that the products have the space group Pm-3m, indica-ting that the Mn,Zna.gSi, Gea.4 -- N(x ≥ 0, 0. 1, 0. 15, 0. 2) materials were successfully synthesized. Furthermore, we characterized the thermal expansion property of Mn,Zno.s Si, Geg. 4-,N and found that the starting temperature of NTE opera-tion-temperature window shifted toward low temperature. However, the width of NTE operation-temperature window was maintained after Si doping- The magnetic properties of Mn,Zng.Si,Ge.-,N were also measured by the physical property measurement system (PPMS) , which showed that the paramagnetic (PM) to antiferromagnetic ( AFM) transition around 370 K disappeared afier Si doping. This result coincides well with the low-temperature shift of NTE operation-temperature window, demonstrating the close correlations between NTE property and magnetic transition, Additionally, the spin-glass and ferromagnetic states occurred at low temperatures in Mn,Zng , Geg. N after Si doping.
Key words : Mn,Zna g Gea 4N; Si doping; spark plasma sintering; negative thermal expansion property; magnetic property
1
收稿日期：201503-27
基金项目：国家自然科学基金资助项目（51401224）第一作者：李少鹏，男，1990年生，硕士研究生
通讯作者：李来风，男，1964年生，研究员，博士生导师，
Email ; Iflig@ mail. ipe, ac, en
DOI; 10. 7502/j. issn. 1674 3962. 2015. 07. 05
前言
热胀冷缩是一种多数材料常见的体积效应，即材料
在温度升高时体积变大，而在温度下降时体积变小。根据固体物理的理论，这种效应主要由材料晶格中原子的非简谐热振动引起。在现代光学和电子学等一些精密领域中，材料的热胀冷缩已经成为一个影响器件性能的重要问题，如激光器、天文望远镜的光学器件等受材料热