Low-temperature negative thermal expansion of the antiperovskite manganese nitride Mn3CuN codoped with Ge and Si
Low-temperature negative thermal expansion of the antiperovskite manganese nitride Mn3CuN codoped with Ge and Si
复制标题
Ge、Si共掺反钙钛矿型氮化锰Mn3CuN的低温负热膨胀
DOI：
10.1063/1.2970998
复制
发表时间：
2008-08-25
影响因子：
4
通讯作者：
Qian, Lihe
中科院分区：
文献类型：
--
作者：
Huang, Rongjin;Li, Laifeng;Qian, Lihe
合成了反钙钛矿型氮化锰Mn-3(Cu0.6SixGe0.4-x)N, (x=0-0.2)，并研究了它们在80-300 K温度范围内的负热膨胀（NTE）。我们发现随着Si含量的增加，NTE的转变温度向低温区移动，并且NTE的工作温度窗口（δ T）变宽。通常，Mn-3(Cu0.6Si0.15Ge0.25)N中鉴定的巨大低温NTE系数高达-16 x 10(-6) K-1，其δ T宽可达100 K。测量了这些化合物的磁性，并将其与扩大的NTE操作温度窗口相关联。这一发现突出了NTE材料在低温工程中的潜在应用。(C) 2008年美国物理研究所。
We have synthesized antiperovskite manganese nitrides Mn-3(Cu0.6SixGe0.4-x)N, (x=0-0.2) and investigated their negative thermal expansion (NTE) in the temperature range of 80-300 K. We found that the transition temperature of NTE moves toward lower temperature region and as well the NTE operation-temperature window (Delta T) becomes broader with increasing Si content. Typically, the giant low-temperature NTE coefficient identified in Mn-3(Cu0.6Si0.15Ge0.25)N reaches as large as -16 x 10(-6) K-1, and its Delta T reaches as wide as 100 K. The magnetic properties of these compounds were measured and correlated with the broadened NTE operation-temperature window. The present discovery highlights the potential applications of NTE materials in cryogenic engineering. (C) 2008 American Institute of Physics.