Liquid structure transition upon cooling of liquid Pd40Ni40P20

IF 3.5 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2021-06-07 DOI:10.1063/5.0049043

P. Yu, M. Xia, S. Cao, L. Zeng, W. Q. Lu, J. G. Li

引用次数: 4

Abstract

The precipitates of nano-crystals during solidification obscured the initiation of structural evolution, which in turn hid the information for the understanding of nucleation. Here, we report an endothermic liquid–liquid phase transition of Pd40Ni40P20 alloy far before the nucleation and verified with the in situ synchrotron radiation high-energy x-ray diffraction method and flash differential scanning calorimetry (DSC) analysis. The variations on structure factor, pair-distribution functions (PDFs) and coordination number proved a typical structure transition happen at around 640 °C. And the results of flash DSC confirmed the phenomenon. The observation verifies the liquid–liquid phase transition before nucleation and deepens the understanding of solidification in atomic scale.

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液态Pd40Ni40P20冷却后的液相结构转变

凝固过程中纳米晶的析出物掩盖了结构演化的起始，从而隐藏了理解成核的信息。本文报道了Pd40Ni40P20合金早在成核前就发生了液-液吸热相变，并用同步辐射高能x射线衍射法和瞬发差示扫描量热法(DSC)进行了验证。结构因子、对分布函数(pdf)和配位数的变化表明，在640℃左右发生了典型的结构转变。瞬时DSC的结果证实了这一现象。观察结果验证了成核前的液-液相变，加深了对原子尺度上凝固的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.