Abstract
The temperature dependencies of the electrical conductivity and the thermoelectricpower in Cu1+xMn2-xO4+δ (x = 0 – 0.5) are investigated. The electron transfer is thermally activated and displays a semiconducting behavior. The thermoelectric power shows p-type conduction in all temperature range and decreases with increasing temperature in all samples.The thermoelectric power factor shows a maximum value for x = 0.4 at 600 °C. According to x-ray photoelectron spectroscopy the charge transfer satellites are observed in energy spectrumabout 6 eV from the main peak in all samples. The existence of the charge transfer satellites indicates that there are strong Coulomb interactions between the 3d electrons of the transitionmetal and strong hybridization between the transition metal 3d and the ligand O 2p orbitals.However, the peak intensity of charge transfer of Mn 2p3/2 is hardly affected by Cu substitution.This result suggests that the hybridization of the Mn 3d and O 2p states hardly contribute to the change in the transport properties by Cu substitution.
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