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反钙钛矿结构锰氮化合物奇特的热膨胀性质(英文)

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Abstract:

通过变温X射线衍射技术研究了反钙钛结构Mn3XN(X=Ga,Zn,Sn,Cu)化合物的热膨胀性质。随着温度的升高,此类材料在磁相变附近有时会伴随大的晶格收缩,即负热膨胀效应。尽管如此,晶格收缩并不总是发生,如Mn3ZnN,Mn3CuN,Mn3SnN。对这种独特的热膨胀性质与X位置元素价电子数之间的关系进行了讨论。结果表明3价元素更有利于此类化合物产生负热膨胀效应。通过X位置元素掺杂,可调控此类材料的负热膨胀系数和温区。Mn3Zn0.5Ge0.5N的负热膨胀系数可达-7.15×10-6/K,温区扩展到100K左右。此外,还发现Mn3GaN和Mn3Zn0.7Sn0.3N在室温附近,晶胞常数随温度的升高几乎保持不变,显示为近零膨胀。

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