Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 324, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2020.115138
Keywords
Density of state; Normal spectral emissivity; Heat capacity at constant pressure; Thermal conductivity
Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [18J11474, 20K22464]
- Grants-in-Aid for Scientific Research [18J11474, 20K22464] Funding Source: KAKEN
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The normal spectral emissivities, heat capacities, and thermal conductivities of Pd and Ti melts were measured using an electromagnetic levitation technique in a static magnetic field. The results were compared with values evaluated by a free electron model, leading to discussions on the correlation between density of states at Fermi energy and thermal diffusivities for transition metals.
The normal spectral emissivities at 807 and 940 nm, heat capacities at constant pressure and thermal conductivities of Pd and Ti melts were measured using an electromagnetic levitation technique in a static magnetic field. The static magnetic field suppresses the surface oscillation, translational motion, and convection flow on electromagnetically levitated samples. The convections in the levitated Pd and Ti melts were suppressed sufficiently for thermal conductivity measurement by the static magnetic field. The emissivities and heat capacities of Pd and Ti melts showed no temperature dependence within the experimental temperature region. The thermal conductivity of Pd melt was constant within experimental temperature region, on the other hand, the thermal conductivity of Ti melt increased with increasing temperature. The measured emissivity and thermal conductivity were compared with values evaluated by a free electron model such as Drude model and Wiedemann-Franz law. Based on the results, the correlation between density of states (DOS) at Fermi energy and thermal diffusivities for transition metals was discussed. (C) 2020 The Author(s). Published by Elsevier B.V.
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