传统的高温超导金属,共价结合,二进制客C-B合物
Nisha Geng1, Katerina P Hilleke1, Li Zhu2
1Department of Chemistry, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States.
Journal of the American Chemical Society
|January 9, 2023
概括
密度函数理论 (DFT) 的计算显示,金属离子大小对于稳定酸盐结构中的B-C框架至关重要. 研究人员发现了22种新的动态稳定的二进制客体化合物,其中KPbB6C6被预测为高温超导体.
科学领域:
- 材料科学
- 固态化学
- 计算化学
背景情况:
- 在酸盐结构中合成XB3C3化合物激发了相关材料的兴趣.
- 了解这些酸盐化合物的稳定性和性质的因素对于发现新的功能材料至关重要.
研究的目的:
- 使用DFT,研究金属阴离子大小对XB3C3酸盐化合物的动态稳定性的影响.
- 在环境压力下计算选大量二进制客XYB6C6化合物.
- 探索这些材料中超导特性,特别是临界温度 (Tc) 的可调性.
主要方法:
- 用密度功能理论 (DFT) 的计算来研究XB3C3和XYB6C6化合物的电子结构和稳定性.
- 使用DFT化学压力分析来评估金属离子体大小对框架稳定性的影响.
- 对105种XYB6C6化合物进行了高通量选,以确定动态稳定的相位.
主要成果:
- 在B-C框架中,金属离子尺寸被认为是实现环境压力动态稳定的关键因素.
- 在105个选的XYB6C6化合物中,22个被发现在1 atm时具有动态稳定性,扩大了已知的潜在合成相库.
- 超导的临界温度 (Tc) 可以通过调整金属原子的平均氧化状态来调整,在平均价值值为+1.5时观察到的最佳Tc.
- 预计KPbB6C6在研究阶段中表现出88K的最高环境压力Eliashberg Tc.
结论:
- 这项研究为设计和合成新型稳定的酸盐化合物提供了计算路线图.
- KPbB6C6是高温超导的有希望的候选物,有可能通过高压技术合成.
- 这些发现突出了通过精心选择酸盐结构中的客金属原子来调整材料性能的潜力.
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