Atomic Heat of Graphite between 1 and 20°K

The atomic heat of pure artificial polycrystalline graphite has been measured between 1 and 4^ and 10 and 20^. Precautions were taken to ensure that no error was introduced by gas adsorbed on the graphite. Below 2^ the atomic heat can be represented as the sum of a term proportional to T^3 arising from lowfrequency lattice waves and a term proportional to T due to electrons: C=0. 0325T^3+0. 031T millijoules/mole degree. Between 2. 25^ and 4. 5^, C=0. 115T^2+0. 031T-0. 237 millijoules/mole degree; between 10 20^, C=0. 208T^2-6. 8 millijoules/mole degree.