| Mn12-Ac磁性分子团簇单晶的热重-差热分析与结构转变 |
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| 引用本文： | 刘 颖,葛培文,苏少奎,张丽娟,王云平.Mn12-Ac磁性分子团簇单晶的热重-差热分析与结构转变[J].物理学报,2004,53(11):4015-4020. |
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| 作者姓名： | 刘 颖 葛培文 苏少奎 张丽娟 王云平 |
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| 作者单位： | (1)北京化工大学理学院，北京 100029; (2)中国科学院物理研究所，北京 100080; (3)中国科学院物理研究所，北京 100080;北京化工大学理学院，北京 100029 |
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| 基金项目： | 国家自然科学基金重点项目（批准号: 10334080）和中国科学院知识创新工程重要方向性项目（批准号: KJCX2SWW054）资助的课题. |
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| 摘 要： | 通过热重-差热分析(TG-DTA)，考察了Mn12-Ac磁性分子晶体从室温到270℃的热失重过程.结合x射线粉末衍射分析，认为在第一个失重阶段，即25—110℃，Mn12-Ac失去了处于团簇分子间隙的结晶乙酸和结晶水，同时失去了团簇分子中与4个Mn3+配位的4个H2O，Mn12-Ac单晶结构被破坏，但是团簇分子的基本结构依然存在；在第二个失重阶段，即180—230℃，Mn12-Ac转变为γ-Mn2O3，其中混有少量Mn3O4.
关键词：
Mn12
分子团簇
热重-差热分析
x射线衍射
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| 关 键 词： | Mn12 分子团簇 热重-差热分析 x射线衍射 |
| 收稿时间： | 2004-05-31 |
| 修稿时间： | 8/9/2004 12:00:00 AM |
Thermal analysis and structure transformation of Mn12-Ac magnetic molecular crystals |
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| Liu Ying,Ge Pei-Wen,Su Shao-Kui,Zhang Li-Juan,Wang Yun-Ping.Thermal analysis and structure transformation of Mn12-Ac magnetic molecular crystals[J].Acta Physica Sinica,2004,53(11):4015-4020. |
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| Authors: | Liu Ying Ge Pei-Wen Su Shao-Kui Zhang Li-Juan Wang Yun-Ping |
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| Abstract: | The thermal stability of Mn12-AcMn12(CH3COO)16(H2O)4O12]52CH3COOH54H2O magnetic molecular crystals was investigated by TG-DTA from room temperature to 270℃. According to the results of XRD and TG,we found that Mn12-Ac lost the crystal water and the acetic acid molecules of solvation which were located between the adjacent molecules in the temperature range from 25℃ to 1 10℃. At the same time, 4H2O which were linked with 4 Mn3+ were lost. The crystalline structure of Mn12-Ac single crystal was destroyed during this course. However, the core structure in the molecule was well preserved. From 180℃ to 230℃, a further transformatio n took place, Mn12-Ac lost all the CH3COO- ions and turned intoγ-Mn2O3, with a little amount of Mn3O4. |
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| Keywords: | Mn12 molecular cluster TG-DTA XRD |
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