Abstract
Single-phase (Sr 1-x ,K 2x )Zr 4 (PO 4 ) 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 (Sr 1-x ,K 2x )Zr 4 (PO 4 ) 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=K 0 (1-p) regardless of the influence of emissivity factor.
Original language | English |
---|---|
Pages (from-to) | 3765-3768 |
Number of pages | 4 |
Journal | Journal of Applied Physics |
Volume | 75 |
Issue number | 8 |
DOIs | |
State | Published - 1 Dec 1994 |