用贵金属丰富的FePt和CoPt纳米粒子的形态学和相组合
Yuri A Zakharov1, Anna N Popova1, Valery M Pugachev1,2
1Federal Research Center of Coal and Coal Chemistry SB RAS, 650000 Kemerovo, Russia.
Materials (Basel, Switzerland)
|December 9, 2023
概括
这项研究描述了FePt和CoPt纳米合金,揭示了加热后的相组合和形态变化. 这些发现促进了对纳米粒子行为的理解,用于先进的材料应用.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 物理化学 物理化学
背景情况:
- FePt和CoPt纳米合金对于数据存储和催化等应用至关重要.
- 了解它们的相位转换和形态是控制它们属性的关键.
研究的目的:
- 研究FePt和CoPt纳米合金的纳米粒子形态,相组合和热行为.
- 为了确定可溶性极限和识别合成和加热过程中形成的额外相.
主要方法:
- 纳米颗粒的联合减少合成.
- 在现场X射线衍射 (XRD) 和X射线散射.
- 传输电子显微镜 (TEM HR). 传输电子显微镜.
- 循环电压计. 循环电压计.
- 吸附计.吸附计.吸附计.吸附计.吸附计.吸附计.
- 分子动力学 (MD) 模拟.
主要成果:
- 观察到FCC固体溶液,Fe in Pt的可溶性极限为11.4%和Co in Pt的可溶性极限为17.5%.
- 额外相 (XRNDPh-1) 和无形粒子在组成超过溶解度极限时形成.
- 加热诱导的相变,形成或铁缩相 (XRNDPh-2),可能是金属间化合物 (FePt3,CoPt3).
- 纳米合金表现出结构结性和组成异质性,在130-200°C的内部层中富含.
结论:
- 开发了一种考虑纳米效应的纳米合金形成模型.
- 该研究提供了关于FePt和CoPt纳米合金相稳定性和转化途径的见解.
- 结果将为特定应用的纳米合金的设计和合成提供信息.
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