Fig. 6: Thermal transport properties of (Ge1−yPbySe)1−x(Sb2Te3)x samples.
From: Metavalent alloying and vacancy engineering enable state-of-the-art cubic GeSe thermoelectrics
Temperature-dependent of a total thermal conductivity (κ) and b lattice thermal conductivity (κL). c Temperature-dependent and d room-temperature κL derived in the present work and other GeSe-based materials26,27,33,34,35,36,37,38,39,40,41,42,43,58,64. Room-temperature (e) sound velocity (vm) and f Grüneisen constants (γ) as a function of Sb2Te3 and Pb content. g Room-temperature κL as a function of Sb2Te3 content for (GeSe)1−x(Sb2Te3)x series. The red dotted line and bule dotted line represent the fitted κL considering the mass and strain contrast between Ge-Sb and Se-Te, and mass and strain contrast between Ge-Sb, Se-Te, and Ge vacancy, respectively. h Calculated spectral lattice thermal conductivity (κs) using the Debye-Callaway model. i Relationship between μW and 1/κL at 300 K in comparison with literature data27,35,42.
