Sound velocity and density of liquid Ni68S32 under pressure using ultrasonic and X-ray absorption with tomography methods

IF 2 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Comptes Rendus Geoscience Pub Date : 2019-02-01 DOI:10.1016/j.crte.2018.04.005
Hidenori Terasaki , Keisuke Nishida , Satoru Urakawa , Yusaku Takubo , Soma Kuwabara , Yuta Shimoyama , Kentaro Uesugi , Yoshio Kono , Akihisa Takeuchi , Yoshio Suzuki , Yuji Higo , Tadashi Kondo
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引用次数: 1

Abstract

A new experimental setup for simultaneous P-wave velocity (VP) and density (ρ) measurements for liquid alloys is developed using ultrasonic and X-ray absorption methods combined with X-ray tomography at high pressures and high temperatures. The new setup allows us to directly determine adiabatic bulk moduli (KS) and to discuss the correlation between the VP and ρ of the liquid sample. We measured VP and ρ of liquid Ni68S32 up to 5.6 GPa and 1045 K using this technique. The effect of pressure on the VP and ρ values of liquid Ni68S32 is similar to that of liquid Fe57S43. (Both compositions correspond to near-eutectic ones.) The obtained KS values are well fitted to the finite strain equation with a KS0 value (KS at ambient pressure) of 31.1 GPa and a dKS/dP value of 8.44. The measured VP was found to increase linearly with increasing ρ, as approximated by the relationship: VP [m/s] = 1.29 ρ [kg/m3] – 5726, suggesting that liquid Ni–S follows an empirical linear relationship, Birch's law. The dVP/dρ slope is similar between Ni68S32 and Fe57S43 liquids, while the VPρ plot of liquid Ni–S is markedly different from that of liquid Fe–S, which indicates that the effect of Ni on Birch's law is important for understanding the VPρ relation of planetary and Moon's molten cores.

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利用超声和x射线吸收层析成像方法测定液体Ni68S32在压力下的声速和密度
利用超声波和x射线吸收方法结合高压高温下的x射线断层扫描技术,建立了一种新的实验装置,用于同时测量液态合金的纵波速度(VP)和密度(ρ)。新的设置使我们能够直接确定绝热体积模量(KS),并讨论液态样品的VP和ρ之间的关系。我们用这种方法测量了液态Ni68S32在5.6 GPa和1045 K下的VP和ρ。压力对液态Ni68S32的VP和ρ值的影响与液态Fe57S43相似。(两种成分都属于近共晶成分。)得到的KS值与有限应变方程拟合良好,KS0值(常温下的KS)为31.1 GPa, dKS/dP值为8.44。所测VP随ρ的增加而线性增加,近似为:VP [m/s] = 1.29 ρ [kg/m3] - 5726,表明液态Ni-S遵循经验线性关系,即Birch定律。Ni68S32和Fe57S43液体的dVP/ ρ斜率相似,而Ni - s液体的VP -ρ图与Fe-S液体的VP -ρ图明显不同,这表明Ni对Birch定律的影响对于理解行星和月球熔融核的VP -ρ关系具有重要意义。
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来源期刊
Comptes Rendus Geoscience
Comptes Rendus Geoscience 地学-地球科学综合
CiteScore
2.80
自引率
14.30%
发文量
68
审稿时长
5.9 weeks
期刊介绍: Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.
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