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Journal Articles

Thermophysical properties of dense molten Al $_{2}$ O $_{3}$ determined by aerodynamic levitation

Sun, Y.*; Takatani, Tomoya*; Muta, Hiroaki*; Fujieda, Shun*; Kondo, Toshiki; Kikuchi, Shin; Kargl, F.*; Oishi, Yuji*

International Journal of Thermophysics, 45(1), p.11_1 - 11_19, 2024/01

https://doi.org/10.1007/s10765-023-03302-2

Times Cited Count：0 Percentile：0.07(Thermodynamics)

no abstracts in English

Journal Articles

Thermophysical properties of molten (Fe $_{2}$ O $_{3}$ ) $_{0.95}$ -(SiO $_{2}$ ) $_{0.05}$ measured by aerodynamic levitation

Kondo, Toshiki; Toda, Taro*; Takeuchi, Junichi*; Kikuchi, Shin; Kargl, F.*; Muta, Hiroaki*; Oishi, Yuji*

High Temperatures-High Pressures, 52(3-4), p.307 - 321, 2023/06

https://doi.org/10.32908/hthp.v52.1405

Times Cited Count：0 Percentile：0.02(Thermodynamics)

In order to establish an evaluation method/numerical simulation for nuclear reactor safety under severe accidental conditions, it is necessary to obtain the physical properties, especially fluidity of the relevant molten materials at very high temperatures. In this study, thermophysical properties such as density and viscosity were obtained for (Fe $_{2}$ O $_{3}$ ) $_{0.95}$ -(SiO $_{2}$ ) $_{0.05}$ , which is a representative composition in the early stage of severe accident. (Fe $_{2}$ O $_{3}$ ) $_{0.95}$ -(SiO $_{2}$ ) $_{0.05}$ is produced by the contact between the molten oxide of steel, which is the main component of the reactor, and SiO $_{2}$ , which is the main component of concrete. As a result, the physical properties of the (Fe $_{2}$ O $_{3}$ ) $_{0.95}$ -(SiO $_{2}$ ) $_{0.05}$ mixture were almost the same as those of Fe $_{2}$ O $_{3}$ obtained in previous studies, and it could be concluded that a small amount of SiO $_{2}$ (about 5 mol.%) did not significantly affect the fluidity of Fe $_{2}$ O $_{3}$ .

Journal Articles

Thermophysical properties of molten FeO $_{1.5}$ , (FeO $_{1.5}$ ) $_{0.86}$ -(ZrO $_{2}$ ) $_{0.14}$ and (FeO $_{1.5}$ ) $_{0.86}$ -(UO $_{2}$ ) $_{0.14}$

Kondo, Toshiki; Toda, Taro*; Takeuchi, Junichi*; Kargl, F.*; Kikuchi, Shin; Muta, Hiroaki*; Oishi, Yuji*

Journal of Nuclear Science and Technology, 59(9), p.1139 - 1148, 2022/09

https://doi.org/10.1080/00223131.2022.2032445

Times Cited Count：1 Percentile：31.61(Nuclear Science & Technology)

no abstracts in English

Journal Articles

XAFS study of molten zinc dibromide

Okamoto, Yoshihiro; Fukushima, Kazuko*; Iwadate, Yasuhiko*

Journal of Non-Crystalline Solids, 312(314), p.450 - 453, 2002/10

Local structure of molten ZnBr was investigated by both of the Zn and the Br XAFS (X-ray absorption fine structure) measurements above their K-absorption edge at 723 K. The nearest Zn $^{2+}$ -Br distance was determined to be 2.46 for the Zn XAFS and 2.45 for the Br XAFS. The coordination number of Br ion around Zn $^{2+}$ was about 4. On the other hand, that of Zn $^{2+}$ ion around Br was about 2. The 1st Br-Br distance was estimated to be 3.9 . They shows that a tetrahedral coordinate (ZnBr) $^{2-}$ exists and most of the coordinate connects with the next ones through Br ion. The two XAFS functions in the molten ZnBr were reproduced by the combination of the molecular dynamics(MD) simulation and the FEFF7 computations.