Thermal Studies of Cax Ba1-x TiO3

Measurements have been carried out on Ca x Ba 1- x TiO 3 ceramics for which 0≤ x ≤0.19. The thermal diffusivity was measured from -60° to 230°C and the thermal conductivity was measured from 40° to 150°C. The electrical properties were also measured as a function of temperature. The velocities of dilatational elastic waves were measured for these ceramics at room temperature. The increase in the thermal resistance with increasing x -value is accounted for within the limits of error of the measurements by using a Debye distribution for the phonon spectrum and attributing the phonon scattering to the mass difference between the Ba atoms and the substitutional Ca atoms.