Si-C-N 结构的硬度和电子特性
Shuai Chen1, Xiaogang Guo1, Hefei Li1
1Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China. hjl@ysu.edu.cn.
Physical chemistry chemical physics : PCCP
|October 4, 2023
概括
三种新的碳化物 (Si-C-N) 结构具有独特的导电性和硬度特性. SiC3N3和SiC7N6是导电硬材料,而SiC13N14是一个准超硬半导体.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学的计算化学
- 固态物理 固态物理
背景情况:
- 探索具有定制电子和机械性能的新材料对于技术进步至关重要.
- 碳化物 (Si-C-N) 化合物提供了一个有前途的途径,因为Si,C和N之间的各种结合可能性.
- 了解新的Si-C-N结构的基本特性对于预测它们的潜在应用至关重要.
研究的目的:
- 通过计算设计和描述新的六角形Si-C-N结构.
- 研究这些新材料的稳定性,电子导电性和机械硬度.
- 根据其预测的属性来确定潜在的应用.
主要方法:
- 在α-Si3N4晶体结构的基础上构建了三种新的六角Si-C-N结构 (SiC3N3,SiC7N6,SiC13N14).
- 分析弹性常数和声子分散光谱,以评估稳定性.
- 形成能量的计算,带结构,状态的部分密度和电子轨道分析.
- 使用两种硬度模型和隙剪切应力计算来估计维克斯硬度.
主要成果:
- SiC3N3和SiC7N6结构具有孔导电性,分别具有3D和1D导电性.
- SiC13N14被确定为具有4.39 eV的宽带间隙的半导体.
- 估计的维克斯硬度值表明SiC3N3和SiC7N6是导电硬材料,SiC13N14是准超硬材料.
结论:
- 新设计的Si-C-N结构展示了一系列有前途的特性.
- SiC3N3和SiC7N6适用于要求电导率和硬度的应用.
- C13N14对要求极度硬度和半导体性能的应用具有潜力.
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