THERMAL-EXPANSION AND THERMAL-CONDUCTIVITY OF CS2CRO4

The temperature dependence of the lattice parameters of Cs2CrO4 was me asured by the high-temperature X-ray diffraction method from 293-873 K . The linear thermal expansion of Cs2CrO4 obtained from the temperatur e dependence of the lattice parameters was 2.34% at 873 K, which was a bout four times that of UO2 and more than twice that of the stainless steel (SS316). The thermal diffusivity of Cs2CrO4 was measured by the laser flash method from 296-1040 K. The thermal conductivity of Cs2CrO 4 was evaluated from the measured thermal diffusivity and bulk density , and the specific heat capacity from the literature. The thermal cond uctivity of Cs2CrO4 corrected for 100% TD remained almost constant up to 500 K, increased with temperature above 500 K, and it was 0.40 W m( -1) K-1 at 800 K, which was less than 10 and 12% of those of UO2 and U 0.8Pu0.2O1.98, respectively. (C) 1998 Elsevier Science B.V. All rights reserved.