@article{f1bfc3a99b2841658bd5b9e06237edfe,
title = "Sound velocity and density of liquid Ni68S32 under pressure using ultrasonic and X-ray absorption with tomography methods",
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 VP–ρ 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 VP–ρ relation of planetary and Moon's molten cores.",
keywords = "Density, High pressure, Liquid, Sound velocity",
author = "Hidenori Terasaki and Keisuke Nishida and Satoru Urakawa and Yusaku Takubo and Soma Kuwabara and Yuta Shimoyama and Kentaro Uesugi and Yoshio Kono and Akihisa Takeuchi and Yoshio Suzuki and Yuji Higo and Tadashi Kondo",
note = "Funding Information: The authors acknowledge M. Hoshino, T. Sakaiya, and S. Yamamoto for their technical support and discussions. The authors also acknowledge R.C. Liebermann and an anonymous reviewer for constructive comments. This work is partly supported by Grants-in-Aid for scientific research (A) and (B) to H.T. (JP23340159, JP26247089) and S.U. (JP23340129) and also partly supported by Grant-in-Aid for Scientific Research on Innovative Areas (JP15H05828). Y.K. acknowledges the support of DOE-BES/DMSE under Award DE-FG02-99ER45775. The experiments have been performed under contract of the SPring-8 facility (proposal numbers: 2011B1278, 2011B1355, 2012A1481, 2013A1072, 2014B1319). Funding Information: The authors acknowledge M. Hoshino, T. Sakaiya, and S. Yamamoto for their technical support and discussions. The authors also acknowledge R.C. Liebermann and an anonymous reviewer for constructive comments. This work is partly supported by Grants-in-Aid for scientific research (A)and (B)to H.T. (JP23340159, JP26247089)and S.U. (JP23340129)and also partly supported by Grant-in-Aid for Scientific Research on Innovative Areas (JP15H05828). Y.K. acknowledges the support of DOE-BES/DMSE under Award DE-FG02-99ER45775. The experiments have been performed under contract of the SPring-8 facility (proposal numbers: 2011B1278, 2011B1355, 2012A1481, 2013A1072, 2014B1319). Publisher Copyright: {\textcopyright} 2018 Acad{\'e}mie des sciences",
year = "2019",
month = feb,
day = "1",
doi = "10.1016/j.crte.2018.04.005",
language = "English",
volume = "351",
pages = "163--170",
journal = "Comptes Rendus - Geoscience",
issn = "1631-0713",
publisher = "Elsevier Masson",
number = "2-3",
}