Combustion synthesized Fe doped CeO2 powder-characterization, optical absorption and EPR spectroscopy.

Abstract

Fe doped CeO2 powder was prepared using solution combustion method. Powder X-ray diffraction and scanning electron microscopy methods are used to char acterize the combustion derived powder. The optical absorption spectrum exhibits three bands due to Fe3? and Fe2? ions. Electron paramagnetic resonance (EPR) spec trum of this sample exhibits number of resonance signals due to Fe3? ions. The number of spins (N) participating in resonance and its paramagnetic susceptibility (v) has been evaluated. From EPR and optical studies it is observed that iron ions are present in trivalent state.