Thermal conductivity, electrical resistivity, and Seebeck coefficient of high-purity chromium from 280 to 1000 K

Abstract

The thermal conductivity λ, electrical resistivity ρ, and Seebeck coefficient S of a high-purity Cr specimen (ρ273/ρ4.2=380) were measured from 285 to 1000 K. The ρ and S of two other Cr specimens (ρ273/ρ4.2=380 and 58) were determined from 300 to 1300 K. The ρ and S results from the three specimens are in excellent agreement and all three properties agree to within experimental uncertainty with previous low-temperature results on the same specimens over the temperature range of overlap. Near T′N (300–320 K), the present λ results are within 0.7% of the previous data and indicate that λρ/T should be smooth to within 1%. At high temperature, the present λ data are about 8% above those of Powell and Tye but the ratios of λρ/T agree to within 2% up to 1000 K. These new data on pure Cr are compared to calculations from standard transport theory and to previous results from W and Mo.