Strontium cobaltite was investigated using solid-electrolyte coulometry and resistivity measurements in the temperature range 20-1050 degrees C and oxygen partial pressures 0.5-400 Pa. Two observed oxygen desorption/sorption maxima within the temperature range 500-950 degrees C correlate with phase transitions of this compound as reported in the literature. An additional oxygen desorption/sorption maximum was found at a temperature of 965-1000 degrees C, which is explained an order-disorder transition of the cubic high-temperature phase. The dependencies of equilibrium values of oxygen content as well as specific resistivity on temperature and oxygen partial pressure were founded for the cubic phase.