Chalcogenides by Design: Functionality through Metavalent Bonding and Confinement.,Advanced Materials

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Chalcogenides by Design: Functionality through Metavalent Bonding and Confinement.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-04-03 , DOI: 10.1002/adma.201908302
Bart J Kooi ₁ , Matthias Wuttig _{2,

3}

Affiliation

A unified picture of different application areas for incipient metals is presented. This unconventional material class includes several main-group chalcogenides, such as GeTe, PbTe, Sb2 Te3 , Bi2 Se3 , AgSbTe2 and Ge2 Sb2 Te5 . These compounds and related materials show a unique portfolio of physical properties. A novel map is discussed, which helps to explain these properties and separates the different fundamental bonding mechanisms (e.g., ionic, metallic, and covalent). The map also provides evidence for an unconventional, new bonding mechanism, coined metavalent bonding (MVB). Incipient metals, employing this bonding mechanism, also show a special bond breaking mechanism. MVB differs considerably from resonant bonding encountered in benzene or graphite. The concept of MVB is employed to explain the unique properties of materials utilizing it. Then, the link is made from fundamental insights to application-relevant properties, crucial for the use of these materials as thermoelectrics, phase change materials, topological insulators or as active photonic components. The close relationship of the materials' properties and their application potential provides optimization schemes for different applications. Finally, evidence will be presented that for metavalently bonded materials interesting effects arise in reduced dimensions. In particular, the consequences for the crystallization kinetics of thin films and nanoparticles will be discussed in detail.

中文翻译：

硫属元素化物的设计：通过亚共价键和封闭作用。

给出了初始金属不同应用领域的统一图片。这种非常规的材料类别包括几种主要的硫族化物，例如GeTe，PbTe，Sb2 Te3，Bi2Se3，AgSbTe2和Ge2 Sb2 Te5。这些化合物和相关材料显示出独特的物理性能。讨论了新颖的图谱，它有助于解释这些特性并分离出不同的基本键合机理（例如，离子键，金属键和共价键）。该图还提供了一种非常规的新结合机理的证据，即纽扣价共价结合（MVB）。采用这种键合机理的初始金属也表现出特殊的键断裂机理。MVB与苯或石墨中的共振键有很大不同。MVB的概念用于解释利用它的材料的独特性能。然后，从基本见识到与应用相关的属性建立了链接，这些属性对于将这些材料用作热电，相变材料，拓扑绝缘体或用作有源光子组件至关重要。材料性能及其应用潜力的密切关系为不同的应用提供了优化方案。最后，将提供证据表明，对于亚共价键合的材料，有趣的效果是尺寸减小了。特别是，将详细讨论薄膜和纳米颗粒结晶动力学的后果。材料性能及其应用潜力的密切关系为不同的应用提供了优化方案。最后，将提供证据表明，对于亚共价键合的材料，有趣的效果是尺寸减小了。特别是，将详细讨论薄膜和纳米颗粒结晶动力学的后果。材料性能及其应用潜力的密切关系为不同的应用提供了优化方案。最后，将提供证据表明，对于亚共价键合的材料，有趣的效果是尺寸减小了。特别是，将详细讨论薄膜和纳米颗粒结晶动力学的后果。

更新日期：2020-04-03

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