Nickel manganese oxides,[1] or nickel manganates, are spinel structure compounds of Nickel, Manganese and Oxygen of the form: Ni(x)Mn(3-x)O(y)[2][3] Some common forms are Ni2MnO4, NiMn2O4, and Ni1.5Mn1.5O4 They are most commonly formulated for use in thin film resistors and thermistors.
[4] The resistivity and temperature coefficient can be accurately controlled in the manufacturing process.
In nickel-metal hydride batteries the addition of manganese oxide provides for formation of spinel structure nickel manganates in various oxidation states, with higher conductivity and charge capacity than nickel hydroxides alone.
The magnetic behavior depends on the cation distribution and spin alignment among them.
Also, these compounds has been studied as electrodes for supercapacitors and as photocatalyst taking advantage of the Change in the oxidation state of the Mn catios.