Thermal conductivity of the Cs-Pb system liquid alloys

• Published in: Physics and chemistry of liquids Vol. 61; no. 4; pp. 253 - 263
• Main Authors: Agazhanov, A. Sh, Abdullaev, R. N., Stankus, S. V., Khairulin, A. R.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 04-07-2023; Taylor & Francis Ltd
• Subjects: Caesium-lead system; Cesium; Composition; Heat transfer; Lead; Liquid alloys; Liquid metals; Liquidus; Lorenz number; Molten salts; Short range order; Thermal conductivity; thermal diffusivity; Zintl ions
• ISSN: 0031-9104; 1029-0451
• DOI: 10.1080/00319104.2023.2207712

Thermal conductivity of liquid alloys of the caesium-lead system with a Pb content of 40, 50, 60, and 66.7 at. % is measured by the laser flash method in the temperature range from the liquidus line to 1173 K with an error of 4-6%. It is found that the thermal conductivity of the investigated alloys, obtained by mixing liquid metals Cs and Pb, drops by an order of magnitude to values: 0.5-4.0 W/(m K), characteristic of molten salts. It is shown that the thermal conductivity concentration dependence of the Cs-Pb system liquid alloys has a broad minimum near the equiatomic composition. An analysis of the obtained experimental data indicates the formation of a chemical short-range order in the liquid Cs-Pb system in the vicinity of the equiatomic composition, which indirectly confirms the existing ideas about the presence of Zintl complexes Cs
4
Pb
4
in these melts.