<br>Mn2Ga2S5 和 Mn2Al2Se5 范德华硫化物：原子薄纳米材料的来源,Molecules

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Mn2Ga2S5 和 Mn2Al2Se5 范德华硫化物：原子薄纳米材料的来源
Molecules ( IF 4.2 ) Pub Date : 2024-04-28 , DOI: 10.3390/molecules29092026
Ivan V Chernoukhov ₁ , Alexey V Bogach ₂ , Kirill A Cherednichenko ₃ , Ruslan A Gashigullin ₁ , Andrei V Shevelkov ₁ , Valeriy Yu Verchenko ₁

Affiliation

含有 3d 过渡金属的层状硫属化物有望开发具有有趣磁性的二维纳米材料。由于低能范德华键，原子薄层的机械和基于溶液的剥离都是可能的。在本文中，我们介绍了 Mn2Ga2S5 和 Mn2Al2Se5 层状黄铜的合成和晶体结构。对于 Mn2Ga2S5，我们报道了磁性，以及纳米薄膜和纳米卷轴的剥离。描述了多晶相和单晶的合成，并研究了它们在空气中的化学稳定性。通过粉末 X 射线衍射和高分辨率透射电子显微镜探测晶体结构。新化合物 Mn2Al2Se5 与 Mn2Ga2S5 同晶，以 Mg2Al2Se5 结构类型结晶。晶体结构由硫族原子的六方紧密堆积层的 ABCBCA 序列构成，其中 Mn2+ 和 Al3+/Ga3+ 物种分别优先占据八面体和四面体空隙。Mn2Ga2S5 在 13 K 时表现出类似反铁磁的转变，并伴有磁化的铁磁滞。磁性系统的显著挫折可能会在低温下产生自旋玻璃行为。在非极性溶剂中进行 Mn2Ga2S5 层的剥离。使用高分辨率透射电子显微镜观察纳米层和纳米卷曲。厚度为 70-100 纳米的微米级微晶碎片沉积在玻璃表面上，原子力显微镜证明了这一点。

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Mn2Ga2S5 and Mn2Al2Se5 van der Waals Chalcogenides: A Source of Atomically Thin Nanomaterials

Layered chalcogenides containing 3d transition metals are promising for the development of two-dimensional nanomaterials with interesting magnetic properties. Both mechanical and solution-based exfoliation of atomically thin layers is possible due to the low-energy van der Waals bonds. In this paper, we present the synthesis and crystal structures of the Mn2Ga2S5 and Mn2Al2Se5 layered chalcogenides. For Mn2Ga2S5, we report magnetic properties, as well as the exfoliation of nanofilms and nanoscrolls. The synthesis of both polycrystalline phases and single crystals is described, and their chemical stability in air is studied. Crystal structures are probed via powder X-ray diffraction and high-resolution transmission electron microscopy. The new compound Mn2Al2Se5 is isomorphous with Mn2Ga2S5 crystallizing in the Mg2Al2Se5 structure type. The crystal structure is built by the ABCBCA sequence of hexagonal close-packing layers of chalcogen atoms, where Mn2+ and Al3+/Ga3+ species preferentially occupy octahedral and tetrahedral voids, respectively. Mn2Ga2S5 exhibits an antiferromagnetic-like transition at 13 K accompanied by the ferromagnetic hysteresis of magnetization. Significant frustration of the magnetic system may yield spin-glass behavior at low temperatures. The exfoliation of Mn2Ga2S5 layers was performed in a non-polar solvent. Nanolayers and nanoscrolls were observed using high-resolution transmission electron microscopy. Fragments of micron-sized crystallites with a thickness of 70–100 nanometers were deposited on a glass surface, as evidenced by atomic force microscopy.

更新日期：2024-04-28

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