Temperature-dependent thermal conductivity of powdered zeolite NaX

The thermal conductivity of evacuated packed powders of zeolite NaX have been measured as a function of particle size (2 μm and 800 nm) and temperature (ca. 5–390 K ). The temperature dependence of the thermal conductivity of polycrystalline zeolite NaX over the particle size range studied here is glass-like and the results show a clear particle size effect. Room temperature values of the effective thermal conductivity of NaX, adjusted to 100% packing fraction, are 0.16 and 0.08 W m−1 K−1, for the 2 μm and 800 nm particle sizes, respectively.