结晶相变材料中独特的键断裂和对价键的追求,Advanced Materials

当前位置： X-MOL 学术 › Adv. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

结晶相变材料中独特的键断裂和对价键的追求
Advanced Materials ( IF 27.4 ) Pub Date : 2018-03-23 , DOI: 10.1002/adma.201706735
Min Zhu ₁ , Oana Cojocaru-Mirédin ₁ , Antonio M. Mio ₁ , Jens Keutgen ₁ , Michael Küpers ₂ , Yuan Yu ₁ , Ju-Young Cho ₁ , Richard Dronskowski _{2,

3} , Matthias Wuttig _{1,

3,

4}

Affiliation

研究了激光辅助场蒸发的多种化合物，包括采用原子探针层析成像的非晶相和晶体相变材料。这项研究揭示了非晶相变材料和晶体相变材料在场蒸发方面的显着差异。仅对于结晶相变材料，发现多个事件的高概率，每个激光脉冲检测到多个离子。这种异常场蒸发的细节不同于先前显示的任何其他机制，导致多种事件发生的可能性很高。相反，无定形相变材料以及其他共价键合的化合物和金属在多种情况下的概率要低得多。因此，非晶态和晶体相变材料中的激光辅助场蒸发揭示了键断裂的显着差异。这表明结合方面的明显差异。这些发现表明，晶体相变材料中的键合机理与常规键合机理（例如金属，离子和共价键合）有很大的不同。取而代之的是，这里报道的数据证实了最近发展的猜想，即除了先前提到的那些以外，亚共价键是一种新颖的键合机制。

"点击查看英文标题和摘要"

Unique Bond Breaking in Crystalline Phase Change Materials and the Quest for Metavalent Bonding

Laser‐assisted field evaporation is studied in a large number of compounds, including amorphous and crystalline phase change materials employing atom probe tomography. This study reveals significant differences in field evaporation between amorphous and crystalline phase change materials. High probabilities for multiple events with more than a single ion detected per laser pulse are only found for crystalline phase change materials. The specifics of this unusual field evaporation are unlike any other mechanism shown previously to lead to high probabilities of multiple events. On the contrary, amorphous phase change materials as well as other covalently bonded compounds and metals possess much lower probabilities for multiple events. Hence, laser‐assisted field evaporation in amorphous and crystalline phase change materials reveals striking differences in bond rupture. This is indicative for pronounced differences in bonding. These findings imply that the bonding mechanism in crystalline phase change materials differs substantially from conventional bonding mechanisms such as metallic, ionic, and covalent bonding. Instead, the data reported here confirm a recently developed conjecture, namely that metavalent bonding is a novel bonding mechanism besides those mentioned previously.

更新日期：2018-03-23

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南