Electrical properties of copper–manganese spinel solutions and their cation valence and cation distribution

The cation valence and distribution in copper manganese spinels containing 1.0–1.6mol copper per formula unit (CuxMn3−xO4) was resolved from their electrical conductivity and thermoelectric properties. The limit of thermal stability of the cubic spinel phase was also determined for each stoichiometry. A corrected phase diagram for the Cu–Mn–O system in air is proposed accordingly. The electronic defect structure could be described through a …