Abstract: In continuation of work on potentials for the design of high-performance thermal barrier coatings based on three-component ceramic materials containing rare-earth oxides, here we discuss the results of our study of the effects of components on the thermophysical properties of Gd₂O₃–ZrO₂–HfO₂ ceramics. Gadolinium oxide and hafnium oxide stabilize the thermal coefficient of linear expansion (TCLE) of ceramic samples in the three-component system Gd₂O₃–ZrO₂–HfO₂. Given that the gadolinium oxide and hafnium oxide are in equal amounts (10 to 15 mol %) and zirconia is an amount of at least 70 mol %, the TCLE (α_L) of Gd₂O₃–ZrO₂–HfO₂ ceramics ranges from 7.4 × 10^–6 to 10.5 × 10^–6 with acceptable values of thermal conductivity (0.98–1.35 W/(m K)).