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Scientific Research
J. O. Akinlami
A. M. Awobode
Here we report the electronic structure of Cadmium Rhenium Oxide Cd2Re2O7. The theoretical photoemission (PES) spectrum at = 21.2eV shows three distinct structures with peaks at –3.0eV, –8.2eV, and –18.6eV which is the most prominent peak. On increasing the photon energy to 800eV, the peak at –3.0eV increases in intensity, peak at –8.2eV remains a prominent peak and the peak at –18.6eV faded away. On the basis of the results of band structure calculation, these structures are interpreted to be associated with the density of states features. The peak at –3.0eV arises from symmetry point L at –0.1eV, the peak at –8.2eV comes from symmetry point L at –0.2eV and the peak at –18.6eV comes from the symmetry point L at –0.5eV. Peak at –3.0eV and at –8.2eV are separated by a energy gap of –5.2eV and peak at –8.2eV and –18.6eV are separated by an energy gap (or energy level difference) of –10.4eV. It can be observed that the energy gap widens as it goes from peak at –3.2eV to –8.2eV and from peak at –8.2eV to –18.6eV. Finally, the energy gap or energy level difference between two peaks for Cd2Re207 fell within the range –0.5eV to –7.5eV indicating that they could be used for the development of solid-state devices such as blue light emitting diodes, lasers, solar cells and micro wave devices..