Negative thermal expansion and electrical properties of Mn3(Cu0.6NbxGe0.4 − x)N (x = 0.05–0.25) compounds
Negative thermal expansion and electrical properties of Mn3(Cu0.6NbxGe0.4 − x)N (x = 0.05–0.25) compounds
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DOI：
10.1016/j.matlet.2007.12.003
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发表时间：
2008-06
影响因子：
3
通讯作者：
Rong Huang;W-ping Xu;Xiuyan Xu;Lianhui Li;X. Pan;D. Evans
中科院分区：
文献类型：
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作者：
Rong Huang;W-ping Xu;Xiuyan Xu;Lianhui Li;X. Pan;D. Evans
采用机械球磨和固相烧结法制备了通式为Mn 3（Cu0.6NbxGe0.4−x）N（x=0.05，0.1，0.15，0.2，0.25）、Mn 3（Cu0.6Ge0.4）N和Mn 3（Cu0.7Ge0.3）N的块体材料。在80-300 K温度范围内研究了它们的热膨胀系数和电导率。结果表明，Mn 3（Cu0.6Nb0.15Ge0.25）N和Mn 3（Cu 0.6Nb 0.2Ge 0.2）N的负温膨胀行为的温度区间约为95 K，是Mn 3（Cu 0.7Ge 0.3）N的2倍。Mn 3（Cu0.6Nb0.15Ge0.25）N在165 ~ 210 K温度范围内的负热膨胀可达−19.5×10− 6 K − 1。该系列材料的电导率约为2.5×106（Ω m）−1。
Bulk materials with the general formula of Mn3(Cu0.6NbxGe0.4−x)N (x=0.05, 0.1, 0.15, 0.2, 0.25), Mn3(Cu0.6Ge0.4)N and Mn3(Cu0.7Ge0.3)N were fabricated by mechanical ball milling and solid state sintering. Their thermal expansion coefficients and electrical conductivities were investigated in the temperature range of 80–300 K. It is found that the temperature interval of negative temperature expansion behavior is about 95 K in the samples of Mn3(Cu0.6Nb0.15Ge0.25)N and Mn3(Cu0.6Nb0.2Ge0.2)N, which is twice as large as that of Mn3(Cu0.7Ge0.3)N. The negative thermal expansion of Mn3(Cu0.6Nb0.15Ge0.25)N can reach to −19.5×10−6K−1in the temperature range of 165 to 210 K. The electrical conductivity of this series materials is in a level of about 2.5×106(Ω m)−1.