FIG. 3.

(a) Thermal conductivity vs. temperature. Purple and gray lines depict VCA models without fitting parameters for Cu_0.2Ni_0.80 and Zn_0.4Mg_0.60, while maroon line is the minimum thermal conductivity model for J14 ($k_{\min }$); shaded regions indicate uncertainties in the model. Thermal conductivity data is shown together with VCA models with and without adjustable parameters for (b) ${\text{Cu}}_{0.2}{\text{Ni}}_{0.8}\text{O}$, (c) ${\text{Zn}}_{0.4}{\text{Mg}}_{0.6}\text{O}$, (d) ${\text{Co}}_{0.25}{\text{Ni}}_{0.75}\text{O}$, (e) J14 (f) J35, and (g) a-J14.