Thermal conduction behavior in polycrystalline (Sr1−x,K2x)Zr4(PO4)6 ceramic

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Abstract
Single‐phase (Sr1−x,K2x)Zr4(PO4)6 ceramic (with x=0.0–0.8) demonstrated values of thermal conductivity decrease with increasing potassium content to a minimum value at x=0.5, which suggests a maximum content of lattice defect, i.e., oxygen vacancy, at this composition. The thermal conductivity of the ceramic then increased with further increase of potassium. The thermal conduction in (Sr1−x,K2x)Zr4(PO4)6 ceramic (at x=0.5) appears to exhibit a strongly lattice‐defect dependence with a calculated phonon mean free path of approximately 3.04 Å, rather than a phonon‐phonon dependence as observed in a number of dielectric materials. A linear relationship of the thermal conductivity in terms of porosity with temperature up to 600 °C has been correlated and can be simply expressed as K=K0 (1−p) regardless of the influence of emissivity factor.