Fig. 4: Thermal transport properties and zT.
From: Approaching crystal’s limit of thermoelectrics by nano-sintering-aid at grain boundaries
Temperature dependent (a) thermal conductivity κ, b lattice thermal conductivity κL, and d zT values for Mg3.2Bi1.195Sb0.795Te0.01 – x wt% Mg2Cu (x = 0, 2, 3, 5, 7, 10). c A comparison of lattice thermal conductivity κL between x = 0% and 5% Mg2Cu samples below 300 K (solid symbols). Calculated κL using the Debye-Callaway model is included to separate the contributions from various phonon scattering mechanisms to the κL. U, PD, B, and NP denote the phonon–phonon Umklapp process, point defect scattering, grain boundary scattering, and nanoprecipitate scattering.
