Thermal transport crossover from crystalline to partial-crystalline partial-liquid state

Yanguang Zhou (), Shiyun Xiong (), Xiaoliang Zhang, Sebastian Volz () and Ming Hu ()
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Yanguang Zhou: RWTH Aachen University
Shiyun Xiong: Soochow University
Xiaoliang Zhang: School of Energy and Power Engineering, Dalian University of Technology
Sebastian Volz: Combustion (EM2C), Ecole Centrale Paris, Grande Voie des Vignes
Ming Hu: RWTH Aachen University

Nature Communications, 2018, vol. 9, issue 1, 1-8

Abstract: Abstract Phase-change materials (crystalline at low temperatures and partial-crystalline partial-liquid state at high temperatures) are widely used as thermoelectric converters and battery electrodes. Here, we report the underlying mechanisms driving the thermal transport of the liquid component, and the thermal conductivity contributions from phonons, vibrations with extremely short mean free path, liquid and lattice-liquid interactions in phase-changed Li2S. In the crystalline state (T ≤ 1000 K), the temperature dependent thermal conductivity manifests two different behaviors, i.e., a typical trend of 1/T below 800 K and an even faster decrease between 800 and 1000 K. For the partial-crystalline partial-liquid Li2S when T ≥ 1100 K, the contributions of liquid and lattice-liquid interactions increase significantly due to the fluidization of Li ions, and the vibrations with extremely short mean free path, presumably assimilated to diffusons, can contribute up to 46% of the total thermal conductivity at T = 1300 K.

Date: 2018
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DOI: 10.1038/s41467-018-07027-x

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