fig8

Figure 8. For four compounds in the Ca₈YbZn_4.5-yCu_ySb₉ (0 ≤ y ≤ 0.15) system, temperature-dependent (A) total thermal conductivity κ_tot and (B) figure-of-merit ZT are plotted over the range of 323 to 861 K. Corresponding data for the ternary Ca₉Zn_4.5Sb₉^[19] compound are presented for comparison.