Crystal structure and phase relations for Mn3Sn2 and non-stoichiometric Mn2−xSn
Crystal structure and phase relations for Mn3Sn2 and non-stoichiometric Mn2−xSn
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DOI：
10.1016/s0925-8388(97)00050-9
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发表时间：
1997-08
影响因子：
6.2
通讯作者：
M. Stange;H. Fjellvåg;S. Furuseth;B. Hauback
中科院分区：
文献类型：
--
作者：
M. Stange;H. Fjellvåg;S. Furuseth;B. Hauback
在Mn <$Sn二元体系中，Mn_3Sn_2是一个独特的低温相。在加热时，它在813 K左右包结分解成非化学计量的Mn 2 −xSn相和MnSn 2。Mn 3Sn 2和Mn 2 −xSn的相关系是根据样品描述的，在合成过程中非常小心，以尽量减少由于锰蒸发和/或运输造成的不均匀性。Mn 2 −xSn存在于753 ~ 1157 K之间。Mn 2 −xSn的非化学计量与温度有很强的相关性。在1073 K时，均匀性范围为0.18≤x≤0.23，而在873 K时为0.28≤x≤0.34。Mn 2 −xSn的晶体结构是部分填充的NiAs型。根据粉末X射线衍射和中子衍射数据，解析了有序Mn 3Sn 2相的晶体结构。Mn_3Sn_2与Co_3Sn_2和Ni_3Sn_2同构。讨论了相变和结构关系。
Ordered Mn3Sn2appears as a distinct low-temperature phase in the binary MnSn system. On heating it decomposes peritectoidally around 813 K into the grossly non-stoichiometric Mn2−xSn phase and MnSn2. Phase relations are described for Mn3Sn2and Mn2−xSn on the basis of samples where great care has been taken during synthesis to minimize inhomogeneity owing to manganese evaporation and/or transportation. Mn2−xSn exists between 753 and 1157 K. The non-stoichiometry of Mn2−xSn is strongly temperature dependent. At 1073 K, the homogeneity range is 0.18≤x≤0.23, whereas at 873 K 0.28≤x≤0.34. The crystal structure of Mn2−xSn is of the partly filled-up NiAs-type. The crystal structure of the ordered Mn3Sn2phase was solved on the basis of powder X-ray and neutron diffraction data. Mn3Sn2is isostructural to Co3Sn2and Ni3Sn2. Phase transformation and structural relationships are discussed.