Fig. 4: Mechanism for the coupled performance.

a, b EXAFS of Sn K-edge and κ3-weighted χ(R) function of EXAFS spectra; c XANES C 1s edge spectra for the sample obtained with different annealing treatment cycling; d, e calculated phonon spectra for the Sn-graphitized/amorphous carbon matrix, and f temperature dependence of lattice thermal conductivity (κL).