Abstract
The partial molar free energy, enthalpy, and entropy of oxygen in niobium oxides with O Nb ratios from 2.47 to 2.50 were measured with a galvanic cell in the temperature range from 1084 to 1325 K. The partial molar enthalpies of oxygen of the Nb 2O 5− x and V phases were observed to be nearly independent of composition, indicating the presence of only weak interactions between defects. The value of the slope for the plots of log x in Nb 2O 5− x against log P O 2 was observed to be −1 5.2 which is interpreted in terms of a defect structure involving both singly ionized and doubly ionized oxygen vacancies. The previously proposed phase diagram in the vicinity of Nb 2O 5− x was confirmed by the present emf measurements.
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