Japan Geoscience Union Meeting 2018

Presentation information

[EE] Poster

S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Tectonophysics

[S-IT22] Interaction and Coevolution of the Core and Mantle in the Earth and Planets

Tue. May 22, 2018 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Tsuyoshi Iizuka(University of Tokyo), Hidetoshi Shibuya(Department of Earth and Environmental Sciences, Faculty of Advanced Science and Technology, Kumamoto University), Taku Tsuchiya(愛媛大学地球深部ダイナミクス研究センター, 共同), Kenji Ohta(Department of Earth and Planetary Sciences, Tokyo Institute of Technology)

[SIT22-P08] Development of electric furnace designed for density measurement of metals

*Asaka Kamiya1, Hidenori Terasaki1, Tadashi Kondo1 (1.Osaka University)

Keywords:Density, Iron alloys, High temperature

The empirical linear relationship between density and sound velocity, the Birch's law, is well studied for solid Fe-alloys but it has not been well examined for liquid Fe-alloys yet. Even at ambient pressures, the relation between density and sound velocity can be studied by varying temperatures, especially for liquids. Although density and sound velocity of some liquid Fe-alloys have been reported at ambient pressures, the data-set is not enough and simultaneous measurements of density and sound velocity have not been performed. Thus, we developed an electric furnace designed for measurement of density and sound velocity to study the relationship between density and sound velocity of solid and liquid Fe-alloys. The density and sound velocity are measured using volume measurement and pulse-echo overlap method, respectively.

In this study, we report set-up of the furnace and results of density measurement of solid Fe and Ni up to 1923 K. The measured densities of solid fcc-Fe and fcc-Ni are consistent with previous results with the accuracy of ~1.5 % and ~0.5 %, respectively. The thermal expansion coefficient of fcc-Fe was estimated to be (6.87 ± 0.47)x10-5 [K-1], which was close to the previously reported value of 6.4x10-5 [K-1] (Komabayashi et al. 2010).