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This paper examined experimentally and theoretically the thermal diffusibility (α), heat capacity (CP1) at a constant pressure (1atm, 101.33 kPa) and thermal conductivity (κ=CP1α) for the porous mullite ceramics with 0–55% porosity in a wide temperature range from 298 to 1073K. The change in the κ values with temperature or porosity for the porous mullite was similar to the temperature dependence...