Disentangling Mass–Energy Coupling to Reveal the Intrinsic Lattice Thermal Conductivity of Superionic Cu 2– x S

Key Points

• This research aims to elucidate the role of mass-energy coupling on the intrinsic lattice thermal conductivity of superionic Cu2–xS.
• Analyzed mass-energy coupling effects using theoretical models
• Investigated Soret and Dufour effects on thermal properties
• Measured lattice thermal conductivity of Cu2–xS under varying conditions.
• Identified significant deviations in thermal conductivity due to mass-energy coupling
• Quantified the impact of the Soret effect on thermal transport properties
• Revealed Dufour effect contributes to thermal conductivity reduction.