Thermal conductivity of negative-thermal-expansion oxide, Zr1−xYxW2O8 (x=0.00, 0.01)—temperature dependence and effect of structural phase transition

The temperature dependence of the thermal conductivity of the negative-thermal-expansion oxide, ZrW2O8, was evaluated. The room temperature thermal conductivities of ZrW2O8 and Zr0.99Y0.01W2O8 were approximately 0.80 and 0.65 W m−1 K−1, respectively, which are lower than those of other functional oxides. It was revealed that the mechanism of thermal resistance is phonon–phonon scattering, which is affected by the phase transition at approximately 420 K. The different thermal conductivities of Zr0.99Y0.01W2O8 and ZrW2O8, suggests that Y3+ works as a scattering center for thermal conduction.