Thermal and dielectric properties of zirconyl phosphate compact

Abstract

Experimental results are presented on the measurements of thermal expansion (up to 1500°C), thermal conductivity (up to 1000°C), dielectric constant (up to 450 °C) and tanδ (up to 800 °C) of zirconyl phosphate compacts obtained by sintering at 1600°C. The thermal expansion coefficient of the samples at the temperature below 1100°C was less than 1.7 × 10⁻⁶°C⁻¹. The samples showed a definite shrinkage at temperatures of 1110 and 1470°C due to the phase transformations. The expansion at 1500°C was less than that at 1100°C probably because of the phase transformation. The thermal conductivity at room temperature was a very small value (0.0046 to 0.0065 cal s⁻¹ cm°C⁻¹ cm⁻²). The dielectric constant was close to 9. The value of tan° (−0.0001) measured is one of the lowest values for ceramic materials.