Mn3(Cu1-xGex)N的负热膨胀现象

金属学报

2009, Vol. 45

Issue (1): 97-101

论文

本期目录 | 过刊浏览

Mn₃(Cu_1-xGe_x)N的负热膨胀现象

张从阳; 朱洁; 张茂才

北京科技大学新金属材料国家重点实验室; 北京 100083

NEGATIVE THERMAL EXPANSION PHENOMENA\par OF Mn₃(Cu_1-xGe_xN

ZHANG Congyang; ZHU Jie; ZHANG Maocai

State Key Laboratory of Advanced Metals and Materials; University of Science and Technology Beijing; Beijing 100083

引用本文:

张从阳朱洁张茂才. Mn₃(Cu_1-xGe_x)N的负热膨胀现象[J]. 金属学报, 2009, 45(1): 97-101.
, , . NEGATIVE THERMAL EXPANSION PHENOMENA\par OF Mn₃(Cu_1-xGe_xN[J]. Acta Metall Sin, 2009, 45(1): 97-101.

全文: PDF(765 KB)

摘要:

在氮气保护下于1073 K用固相烧结法制备了Mn₃(Cu_1-xGe_x)N化合物. XRD分析表明, 这类化合物具有Mn₃CuN型反钙钛矿相结构. 采用激光干涉法测量了Mn₃(Cu_1-xGe_x)N化合物的线膨胀系数. 结果表明, 当Ge含量为0.40≦x≦0.60时, Mn₃(Cu_1-xGe_x)N在一定温度范围内出现负热膨胀现象; 随Ge含量的增加, 发生负热膨胀的温度升高且温区变宽, 而负热膨胀性能减弱. 当x=0.60时,发生负热膨胀的温度范围为250-290 K(273 K附近), 线膨胀系数为-65×10^-6 K^-1, 具备应用潜力. 热磁曲线表明, Mn₃(Cu_1-xGe_x)N化合物的负热膨胀现象发生在反铁磁性逐渐向顺磁性转变的过程中,由磁有序逐渐消失、自发磁化强度减小所引起的磁容积效应造成的.

关键词 ：负热膨胀, 反钙钛矿结构, 固相烧结, 磁相变

Abstract：

The metallic nitrides Mn₃(Cu_1-xGe_x)N were prepared by solid-state sintering in the pure nitrogen atmosphere at 1073 K. The X-ray diffraction analysis shows that all of the sintered polycrystalline samples present an antiperovskite structure of Mn₃CuN phase. The linear thermal expansions of compounds Mn₃(Cu_1-xGe_x)N (0.40≦x≦0.60) measured by using Michelson interferometer, exhibited negative thermal expansion near Neel temperature. With increase in the content of Ge, the temperature at which the negative thermal expansion occurred increases while the temperature range widens, but the thermal expansion coefficient decreases. The sample with x=0.60 presents negative thermal expansion in the region of 250-290 K (around 273 K), the linear expansion coefficient can reach to -65×10^-6 K^-1, shows a potential for practical application. The temperature dependence of the magnetization indicates that the negative thermal expansion behavior of Mn₃(Cu_1-xGe_x)N compounds occurs in the gradual transition from antiferromagnetic to paramagnetic state. The negative thermal expansion is caused by magnetovolume effect, originating from magnetic spin order disappearance and magnetic moment decrease near the Neel temperature.

Key words： negative thermal expansion antiperovskite structure solid--state sintering magnetic transition

收稿日期: 2008-06-30

ZTFLH:

TG113.22

作者简介: 张从阳, 男, 1980年生, 博士生

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