Abstract
The nonstoichiometry of neodymium manganite NdMnO 3 phase has been studied by a gravimetric method at 1273 K. The oxygen partial pressures were controlled by using flowing O 2 Ar or H 2 CO 2 mixtures. The existence of hyperstoichiometric phase and the homogeneity range of the phase NdMnO 3+x from x = 0 to 0.065 at 1273 K under various oxygen partial pressures has been revealed. And also the effect of oxygen nonstoichiometry on the phase transition at high temperature has been studied by electrical conductivity and DTA measurements. The transition temperature decreases with increasing oxygen content.
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