| 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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| 引用本文： | 孙莹,温永春,褚立华,聂曼,王聪. 反钙钛矿结构锰氮化合物奇特的热膨胀性质(英文)[J]. 硅酸盐学报, 2009, 37(5) |
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| 作者姓名： | 孙莹 温永春 褚立华 聂曼 王聪 |
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| 作者单位： | 北京航空航天大学,理学院材料物理与凝聚态物理中心,北京,100083 |
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| 基金项目： | 国家自然科学基金，新世纪优秀人才培养计划项目 |
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| 摘 要： | 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人的品格收缩,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位置无素掺杂,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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| 关 键 词： | 热膨胀 磁相变 反钙钛矿 锰氮化物 |
ABNORMAL THERMAL EXPANSION IN ANTI-PEROVSKITE MANGANESE NITRIDE |
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| SUN Ying,WEN Yongchun,CHU Lihua,NIE Man,WANG Cong. ABNORMAL THERMAL EXPANSION IN ANTI-PEROVSKITE MANGANESE NITRIDE[J]. Journal of The Chinese Ceramic Society, 2009, 37(5) |
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| Authors: | SUN Ying WEN Yongchun CHU Lihua NIE Man WANG Cong |
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| Affiliation: | Center for Condensed Matter and Materials Physics;School of Science;Beihang University;Beijing 100083;China |
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| Abstract: | The thermal expansion properties of anti-perovskite Mn3XN(X=Ga,Zn,Sn,Cu) compounds were investigated by X-ray diffraction at different temperatures,and a large negative thermal expansion effect in the compounds was observed.Near magnetic transition,abrupt lattice contraction such as Mn3ZnN,Mn3CuN,Mn3SnN does not always happen.The peculiar thermal expansion behavior of the compounds and its relationship with the different valence electrons at the X site were discussed.The results show that the abnormal therm... |
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| Keywords: | abnormal thermal expansion magnetic transition anti-perovsldte manganese nitrides |
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