Specific heat of platinum below 30 K

The specific heat of 99.999 +% pure platinum was measured in the 0.4-30-K temperature range. Smoothed results are within 1.4% of the selected values of Furukawa, Reilly, and Gallagher. The electronic specific-heat coefficient is 1.551 ± 0.002 mcal/${\mathrm{K}}^2$ g-at. (6.492 ± 0.008 mJ/${\mathrm{K}}^2$ g-at.) and the low-temperature limiting Debye temperature is 238.7 ± 0.7 K. The Debye temperature initially decreases with increasing temperature. A small term proportional to $T^{-2\mathrm{}}$ may be related to the 0.5-ppm Fe impurity. The possibility of iron impurity affecting platinum alloy results is pointed out.