Preparation and properties of copper- and manganese containing mixed oxides

Based on the stability range of the CuxMn3-x04 solid solution, two different preparation methods for polycrystaline samples are proposed: For the compositions 0.98 = × = 1.10 sintering of mixtures of the oxides is used, while for x > 1.10 the spray-dry technique is more advantagous. Several properties like crystal structure, IR spectrum and magnetic properties are indicative of the ionic configuration Conductivity- and thermopower measurements on the cubic spinel Cu1.5Mn1.5O4 indicate an ionic order - disorder transition at about 200 – 300 °C.