Abstract
The equilibrium and free surface sublimation pressures of bismuth telluride were determined by the torsion‐effusion and torsion‐Langmuir techniques, respectively. Based on a least‐square fit, the expression for the equilibrium pressure in the temperature range of 722°–828°K was found to be: 
, where 
is the absolute temperature and the given uncertainties are the standard deviations. A similar treatment of the results of free surface pressure over basal plane oriented single crystals gave the following expression for the apparent total pressure in the temperature range of 741°–793°K: 
. Assuming the sublimation reaction 
, average third‐law enthalpies and activation enthalpies of sublimation at 298°K were found to be 
, respectively. Calculated values of the sublimation coefficient varied from 0.14 at 722°K to 0.39 at 828°K.