Debye Heat Capacity

C(T) = 9nR(T/θD)3∫0θD/T x4ex/(ex−1)2 dx + γT, per mole of formula units.

Hover over the plot to read values.
β = 12π⁴nR / 5θD³
Crossover √(γ/β)
C at 300 K
3nR

Crossover is the temperature where γT equals the low-temperature lattice term βT3. Heat capacities in J mol⁻¹ K⁻¹; C/T in mJ mol⁻¹ K⁻². The marker on the T axis shows θD. Preset values are typical literature figures, rounded.