Structural transitions of 4:1 methanol–ethanol mixture and silicone oil under high pressure

Chen Xiehang; Lou Hongbo; Zeng Zhidan; Cheng Benyuan; Zhang Xin; Liu Ye; Xu Dazhe; Yang Ke; Zeng Qiaoshi

doi:10.1063/5.0044893

Volume 6 Issue 3

May 2021

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Chen Xiehang, Lou Hongbo, Zeng Zhidan, Cheng Benyuan, Zhang Xin, Liu Ye, Xu Dazhe, Yang Ke, Zeng Qiaoshi. Structural transitions of 4:1 methanol–ethanol mixture and silicone oil under high pressure[J]. Matter and Radiation at Extremes, 2021, 6(3): 038402. doi: 10.1063/5.0044893

Citation:

Chen Xiehang, Lou Hongbo, Zeng Zhidan, Cheng Benyuan, Zhang Xin, Liu Ye, Xu Dazhe, Yang Ke, Zeng Qiaoshi. Structural transitions of 4:1 methanol–ethanol mixture and silicone oil under high pressure[J]. Matter and Radiation at Extremes, 2021, 6(3): 038402. doi: 10.1063/5.0044893

Citation:

Chen Xiehang, Lou Hongbo, Zeng Zhidan, Cheng Benyuan, Zhang Xin, Liu Ye, Xu Dazhe, Yang Ke, Zeng Qiaoshi. Structural transitions of 4:1 methanol–ethanol mixture and silicone oil under high pressure[J]. Matter and Radiation at Extremes, 2021, 6(3): 038402. doi: 10.1063/5.0044893

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Structural transitions of 4:1 methanol–ethanol mixture and silicone oil under high pressure

doi: 10.1063/5.0044893

Chen Xiehang^1
,,
Lou Hongbo^1
,,
Zeng Zhidan^1
,,
Cheng Benyuan^{1, 2},
Zhang Xin¹,
Liu Ye¹,
Xu Dazhe¹,
Yang Ke³,
Zeng Qiaoshi^{1, 4
,
,
,}

1.
Center for High Pressure Science and Technology Advanced Research, Pudong, Shanghai 201203, People’s Republic of China
2.
Shanghai Institute of Laser Plasma, Shanghai 201800, People’s Republic of China
3.
Shanghai Synchrotron Radiation Facility, Shanghai 201800, People’s Republic of China
4.
Jiangsu Key Laboratory of Advanced Metallic Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, People’s Republic of China

More Information

Corresponding author: a)Author to whom correspondence should be addressed: zengqs@hpstar.ac.cn
Received Date: 2021-01-20
Accepted Date: 2021-03-24

Available Online: 2021-05-01

Publish Date: 2021-05-15

Abstract

Abstract

A 4:1 (volume ratio) methanol–ethanol (ME) mixture and silicone oil are two of the most widely used liquid pressure-transmitting media (PTM) in high-pressure studies. Their hydrostatic limits have been extensively studied using various methods; however, the evolution of the atomic structures associated with their emerging nonhydrostaticity remains unclear. Here, we monitor their structures as functions of pressure up to ∼30 GPa at room temperature using in situ high-pressure synchrotron x-ray diffraction (XRD), optical micro-Raman spectroscopy, and ruby fluorescence spectroscopy in a diamond anvil cell. No crystallization is observed for either PTM. The pressure dependence of the principal diffraction peak position and width indicates the existence of a glass transition in the 4:1 ME mixture at ∼12 GPa and in the silicone oil at ∼3 GPa, beyond which a pressure gradient emerges and grows quickly with pressure. There may be another liquid-to-liquid transition in the 4:1 ME mixture at ∼5 GPa and two more glass-to-glass transitions in the silicone oil at ∼10 GPa and ∼16 GPa. By contrast, Raman signals only show peak weakening and broadening for typical structural disordering, and Raman spectroscopy seems to be less sensitive than XRD in catching these structural transitions related to hydrostaticity variations in both PTM. These results uncover rich pressure-induced transitions in the two PTM and clarify their effects on hydrostaticity with direct structural evidence. The high-pressure XRD and Raman data on the two PTM obtained in this work could also be helpful in distinguishing between signals from samples and those from PTM in future high-pressure experiments.

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References(41)

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