Abstract
A study has been made of the oxygen loss from nickel manganite at temperatures between 800 and 1220°C in atmospheres with oxygen partial pressures which varied from 0.12–100% oxygen using isothermal gravimetry. An atmosphere-temperature-composition diagram has been constructed which is used in conjunction with high temperature electrical conductance measurements to determine the concentration of conductance cations present in NiMn 2O 4. A comparison of results with those reported in the literature leads to a formula for the cation valence distribution in nickel manganite of Ni 2+ 0.35Mn 2+ 0.65 (Ni 2+ 0.65Mn 3+ 0.70Mn 4+ 0.65) O 2- 4 at 900°C. An equation for the variation of the nickel inversion parameter with temperature has also been derived.
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