Mn-Ni-As金属间化合物中的奇异成分有序
Exotic compositional ordering in Mn-Ni-As intermetallics
摘要：
晶体结构分析工具的最新进展使我们能够描述结构化学中的一种新现象，这种现象至今仍被隐藏着。在这里，我们描述了一个不相称的组成调制，Mn0.6Ni0.4As的晶体结构。样品采用NiAs型结构，但与正常固溶体相比，我们观察到锰和镍分离成MnAs和NiAs层，厚度为2-4个面共享八面体。在实验上，结合三维电子衍射、扫描透射电子显微镜和中子衍射，得到了实验结果。八面体单元在锰层和镍层之间的分布由调制矢量q = 0.360（3）c* 完美地描述。因此，在化合物中存在额外的周期性。位置调制观察到的所有元素作为职业调制的结果。
英文摘要：
Recent advances in tools for crystal structure analysis enabled us to describe a new phenomenon in structural chemistry, which, to this day, has remained hidden. Here we describe a crystal structure with an incommensurate compositional modulation, Mn0.6Ni0.4As. The sample adopts the NiAs type structure, but in contrast to a normal solid solution, we observe that manganese and nickel separate into layers of MnAs and NiAs with thickness of 2-4 face-shared octahedra. Experimentally, results are obtained by combination of 3D electron diffraction, scanning transmission electron microscopy and neutron diffraction. The distribution of octahedral units between the manganese and nickel layers is perfectly described by a modulation vector q = 0.360(3) c*. An additional periodicity is thus present in the compound. Positional modulation is observed of all elements as a consequence of the occupational modulation.
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