Abstract
A study of BaO has been made by use of thermogravimetric analysis, oxygen concentration analysis, and X-ray lattice parameter measurements in the temperature range 850°C ⩽ T ⩽ 1420°C and oxygen pressure range 7 × 10 -6 atm ⩽ p O 2 ⩽ 0·820 atm. Both the weight gain by the BaO samples and subsequently determined excess oxygen concentration were found to be directly proportional to p O 2 1 2 . The enthalpy of incorporation oxygen in the lattice 1 2 O 2(g)=O(excess) was determined to be −0·395 ± 0·034 eV. Creation of vacancies on cation sites or of oxygen interstitials are consistent with the experimental results. As an alternative, the formation of O 2 2− ions, (as in BaO 2) as a result of incorporation of excess oxygen in the lattice, has been suggested.
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