聚合物一氧化碳的高温分解在高达120 GPa的压力下
Demetrio Scelta1,2, Matteo Ceppatelli1,2, Roberto Bini1,2,3
1European Laboratory for Nonlinear Spectroscopy, LENS, Via Nello Carrara 1, 50019 Sesto Fiorentino (FI), Italy.
The Journal of chemical physics
|August 23, 2023
概括
聚合物一氧化碳 (pCO) 在高压和高温下分解成二氧化碳和亚氧化物,不形成晶体pCO. 这种分解高度依赖于压力.
科学领域:
- 高压物理和化学 高压物理和化学
- 在极端条件下的材料科学.
- 碳和氧化合物 碳和氧化合物
背景情况:
- 聚合物一氧化碳 (pCO) 在室温下在无形状态下稳定至50 GPa.
- 理论研究表明,在极端条件下,pCO可能结晶或分解成亚氧化物 (CxOy) 或碳和CO2.
- 对晶体pCO形成或分解途径的实验证据仍然有限.
研究的目的:
- 研究无形聚合物一氧化碳 (a-pCO) 的高温和高压转化.
- 为了确定晶体聚合物一氧化碳是否可以在极端条件下形成.
- 为了阐明a-pCO的分解产物和动力学.
主要方法:
- 使用激光加热的钻石天细胞进行实验调查.
- 进行X射线衍射分析以识别形成的晶体相.
- 温度在700-4000 K之间变化,压力在47-120 GPa之间.
主要成果:
- 无形聚合物一氧化碳 (a-pCO) 在高温和高压下分解.
- 观察到的主要晶体产物是二氧化碳 (CO2) 第五阶段.
- 没有检测到晶体聚合物一氧化碳相.
- 证据表明,形成无形CxOy亚氧化物和碳,这是很难检测的.
- 一个的压力-温度运动边界用于分解表明强大的压力依赖.
结论:
- 在极端条件下,聚合物一氧化碳 (pCO) 分解为CO2和可能无形的亚氧化物/碳.
- 在研究的压力-温度模式下,晶体pCO不会形成.
- 分解过程呈现出高度压力敏感的动力屏障.
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