Accurate meas urements of the heat capacity of a-aluminum ox ide (corundum) from 13 0 to 1,170 0 K nrc d escrib ed. An a diabatic calorimeter was used from 13 0 to 380 0 K and a drop method was used with a Bun se n ice calorimeter from 273 0 to 1, 170 0 K . The res ults a rc co mpa red in t he mnge 273 0 to 380 0 K , wh e re t he two methods overlap . From t he d ata, smoo thed values of t he h eat capacity, enthalpy, entropy, and Gibbs free energy from 0 0 to 1,200 0 K are deriv ed a nd tab ul ated.