MHz free electron laser x-ray diffraction and modeling of pulsed laser heated diamond anvil cell
MHz free electron laser x-ray diffraction and modeling of pulsed laser heated diamond anvil cell
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DOI：
10.1063/5.0149836
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发表时间：
2023-09
影响因子：
3.2
通讯作者：
N. Jaisle;David Cébron;Z. Konôpková;R. Husband;C. Prescher;V. Cerantola;A. Dwivedi;J. Kaa;K. Appel;K. Buakor;O. B. Ball;R. S. McWilliams;C. Strohm;M. Nakatsutsumi;U. Zastrau;C. Baehtz;Marzena Anna Baron;E. Edmund;Joydipa Biswas;J. D. McHardy;B. Sturtevant;L. Ehm;Alexander F. Goncharov;M. McMahon;J. Buchen;H. Cynn;E. J. Pace;H. Liermann;D. Sneed;Samantha C. Cooper;Madison Anae;Jaeyong Kim;Zhongyan Wu;Yongjae Lee;H. Hwang;Taehyun Kim;Jinhyuk Choi;Jeongmin Lee;S. Merkel;J. Chantel;E. Koemets;H. Marquardt;V. Prakapenka;S. Chariton;Elena Shevchenko;G. Fiquet;A. Rosa;M. Mezouar;G. Garbarino;G. Morard
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文献类型：
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作者：
N. Jaisle;David Cébron;Z. Konôpková;R. Husband;C. Prescher;V. Cerantola;A. Dwivedi;J. Kaa;K. Appel;K. Buakor;O. B. Ball;R. S. McWilliams;C. Strohm;M. Nakatsutsumi;U. Zastrau;C. Baehtz;Marzena Anna Baron;E. Edmund;Joydipa Biswas;J. D. McHardy;B. Sturtevant;L. Ehm;Alexander F. Goncharov;M. McMahon;J. Buchen;H. Cynn;E. J. Pace;H. Liermann;D. Sneed;Samantha C. Cooper;Madison Anae;Jaeyong Kim;Zhongyan Wu;Yongjae Lee;H. Hwang;Taehyun Kim;Jinhyuk Choi;Jeongmin Lee;S. Merkel;J. Chantel;E. Koemets;H. Marquardt;V. Prakapenka;S. Chariton;Elena Shevchenko;G. Fiquet;A. Rosa;M. Mezouar;G. Garbarino;G. Morard
在欧洲X射线自由电子激光器上实现了一种新的金刚石压腔实验方法，将脉冲激光加热与MHz X射线衍射相结合。在这里，我们使用这个装置来确定在极端条件下的液相线温度，基于时间分辨结晶的测定。重点是与行星核相关的Fe-Si-O三元系统。这种时间分辨的诊断得到了有限元模型的补充，该模型再现了使用条纹光学高温计实验测量的时间温度分布。该模型通过包括(I)压力和温度对材料性质的依赖关系和(Ii)热引起的热应力，包括对材料参数变化的反馈效应来计算温度和应变场。使我们的模型更接近实际，这些改进至关重要，因为它们与以前的模型相比提供了7000K的温差。激光强度是通过寻求测量的温度和模拟的温度之间的最小偏差来确定的。结合模型和条纹光学高温计数据，将温度确定扩展到检测下限以下。本文提出的方法可以根据SiO_2衍射点的出现推断出液相线的温度。此外，模型计算的晶化温度与文献报道的Fe-Si合金晶化温度基本一致。我们的模型再现了行星的相关实验条件，提供了温度、压力和体积条件。然后，这些预测被用来确定在化学迁移受限的实验时间尺度上的液相线温度。这种新颖的时间分辨实验和有限元建模的协同作用进一步推动了钻石砧座实验的解释能力。
A new diamond anvil cell experimental approach has been implemented at the European x-ray Free Electron Laser, combining pulsed laser heating with MHz x-ray diffraction. Here, we use this setup to determine liquidus temperatures under extreme conditions, based on the determination of time-resolved crystallization. The focus is on a Fe-Si-O ternary system, relevant for planetary cores. This time-resolved diagnostic is complemented by a finite-element model, reproducing temporal temperature profiles measured experimentally using streaked optical pyrometry. This model calculates the temperature and strain fields by including (i) pressure and temperature dependencies of material properties, and (ii) the heat-induced thermal stress, including feedback effect on material parameter variations. Making our model more realistic, these improvements are critical as they give 7000 K temperature differences compared to previous models. Laser intensities are determined by seeking minimal deviation between measured and modeled temperatures. Combining models and streak optical pyrometry data extends temperature determination below detection limit. The presented approach can be used to infer the liquidus temperature by the appearance of SiO2 diffraction spots. In addition, temperatures obtained by the model agree with crystallization temperatures reported for Fe–Si alloys. Our model reproduces the planetary relevant experimental conditions, providing temperature, pressure, and volume conditions. Those predictions are then used to determine liquidus temperatures at experimental timescales where chemical migration is limited. This synergy of novel time-resolved experiments and finite-element modeling pushes further the interpretation capabilities in diamond anvil cell experiments.