Temperature Variation of the Mean Debye Temperature ofCu3Au, 20°C to 450°C

The temperature variation of the mean Debye temperature of crystalline ${\mathrm{Cu}}_3$Au at equilibrium order is computed from the values of the elastic constants at equilibrium order obtained by Siegel. The Debye temperature decreases from the value 272°K at 20°C to the value 234°K at 450°C, with a discontinuous drop from 249°K to 239°K at the critical temperature for disordering, 387°C.